The Sunnect AP501 Advanced Protection digital deadbolt lock is designed to provide the highest level of security for your home. Although the first impression you would have when you see the AP501 is its beautiful style, as you study the details of its structure, material, and engineering design, you will conclude that the AP501 is one tough security device built to last.

Tough Construction for Long Life
Comprising mostly metal, and weighing a sturdy six pounds, the AP501 has an exterior compartment with three main components that withstand even the extreme pressure of hammering. Additionally, metal and hard rubber parts support the Tag Key sensor, temporary power terminal, and the keypad to protect the circuitry and prevent unauthorized entry--even if these components are smashed.

For added peace of mind, the one-inch throwbolt is fortified with a five-millimeter-thick carbon core that resists sawing; the battery compartment cover is screwed closed so the batteries won't fall out if the door is slammed shut; and all the vital parts of the lock--the CPU, batteries, motor, latch control mechanism, etc.--are located in the interior unit on the secure side of the door and protected by a heavy-duty interior mounting plate that blocks access. Finally, the bypass circuitry feature protects the PCB in case of a high-voltage surge of power and ensures that the door remains secured.

Rigorously Tested For Exceptional Performance
Each and every AP501 model must undergo rigorous testing to ensure its durability and performance. Automated PCB testers verify that the circuit board is mounted and soldered correctly, every electrical connection is inspected under an x-ray microscope, and both a vibration tester and an impact tester make sure the unit can withstand a wide variety of stresses. Finally, two types of cycle tests mimic human operation of the lock to evaluate its ability to withstand heavy use over a long period of time. See the TESTING section below for details.

Customer-Oriented Warranty Service
Customer Service is the foundation of our company. Through our industry-leading warranty service, if you ever have a problem with the AP501 that could not be resolved over the phone or by email, you can use the Express Option to get a replacement lock first without returning the old one first. This helps make sure you are never without a lock on your door. Please refer to the Two-Year Limited Warranty section for details.

  • B E N E F I T S
  • R O B U S T N E S S
  • Q U A L I T Y
  • T E S T I N G


Designed by experienced engineers of digital door locks used in a dozen countries, AP501 is made with top-quality materials by an ISO 9001 (Quality Management)-certified manufacturer.

  • Protects against lock-picking or vandalism (sand, gum, glue, etc.) by eliminating the conventional keyhole.
  • Designed to withstand kicking, sawing, hammering, and prying.
  • Lost or stolen Tag Keys, which cannot be duplicated, can easily be deleted from the lock, immediately rendering the missing keys useless.
  • Convenient keyless entry using a passcode that can be 3 to 20 digits.
  • Auto lock feature that automatically locks your door when it is closed. It can be turned off during times of high traffic through the door.
  • Matches the beauty of your home with 3 most popular finishes.
  • Guaranteed to fit all standard American doors so that you only need a Phillips screwdriver to install the lock.


Here are some of the features that make the AP501 such a robust door lock.

  • The AP501 is constructed mostly of metal, in both interior and exterior units. Even the keypad cover, battery compartment cover and the Open/Close button are made of metal. No wonder it weighs 6 pounds, 2 to 4 times the weight of most other deadbolt locks!
  • The three main components of the exterior unit are designed to withstand hammering. The Tag Key sensor, temporary power terminal, and the keypad are supported by metal or hard-rubber parts so that any impact on them is born by a 2.5-mm thick metal mounting plate as well as the door surface, thus protecting the circuitry in the exterior unit. Smashing any of these components will not automatically yield access to the intruder.
  • The exterior mounting plate blocks access to the deadbolt latch even if the exterior unit is broken off thus preventing the intruder from unlocking the lock. Most conventional deadbolt locks would immediately expose the deadbolt latch if the exterior unit is broken off, allowing the intruder to manually retract the deadbolt latch and gain access.
  • The 1-inch throwbolt is fortified with a 5-mm thick carbon rod that resists sawing.
  • The opening between the exterior unit and the interior unit (through which the connection cable passes) is small and covered so that hot or cold air from the outside is not allowed to enter the interior unit thus minimizing condensation.
  • Although water-proof, any moisture that still enters the exterior unit or from condensation is allowed to flow down through the weep holes. The weep holes are partially blocked by the mounting plate to prevent abuse.
  • On the interior unit, the battery compartment cover is fastened with a screw so that the batteries do not accidentally fall out if the door is slammed shut. It also has rubber pads to secure the batteries in place.
  • The manual override button directly operates the deadbolt latch. It has no intervening parts other than a directly-connected rotary bar made of metal, so that just about under all circumstances you will be able to open the door from the inside.
  • The vital parts of the lock such as the CPU, PCB, batteries, motor, deadbolt latch drive mechanism, etc., are located in the interior unit on the secure side of the door and are further protected by a heavy-duty interior mounting plate that disallows any access to the vital parts.
  • The AP501 has a bypass circuitry that protects the PCB in case of a high-voltage attack so that the lock remains locked.


The very first point about the quality of the AP501 is that the engineers who designed this door lock and the manufacturing facilities where we make the AP501 have been designing and manufacturing top-notch digital door locks since 1999. Millions of our digital door locks have been in use throughout the world including South Korea (where the locks are manufactured), Japan, England, U.S.A., and even in Kazakhstan. What makes the AP501 special is that it is the culmination of all of the knowledge and experience gained from making digital door locks for almost a decade and that it is made specifically for the American residential doors.

To ensure that each unit of the AP501 digital door lock is made to the highest standards of quality, we start with the materials and components used in the lock. All incoming parts are sampled frequently and some critical parts such as the connector cables are 100% tested before they are entered into the manufacturing process. The suppliers of parts and materials must adhere to strict standards of quality and their performances are measured against an ever-improving benchmark.

Once inspected, the parts are stored in a climate-controlled storage room. The PCBs are manufactured by state-of-the-art lead-free soldering machines that solder computer chips onto the board. As each unit is assembled, it is tested at each step of the assembly line making sure that a defective unit, if any, is detected immediately.

Lastly, our manufacturing facilities, with a monthly production capacity of 100,000 units, are certified for ISO 9001 (Quality Management) and ISO 14001 (Environmental Management Systems).


One of the state-of-the-art lead-free PCB soldering machines.


A finished PCB moves from the soldering machine to the QA section.


Every printed circuit board (PCB) is inspected by an automated PCB Tester to ensure that each computer chip is mounted and soldered correctly.
Every electrical connection is tested and then inspected with an x-ray microscope. The x-ray microscope enables the human inspector to see below the surface of the PCB.
An Electro-Static Discharge (ESD) tester is used to make sure the PCB can withstand ESDs.
Temperature and humidity testing is conducted using a Thermo-Hygrostat. The AP501 has been tested after being exposed to a temperature of -35°F for 6 hours although the stated temperature range for the AP501 is -5°F to 135°F. The hygrostat also simulates humidity in which the AP501 is tested.
A vibration tester and an impact tester are used make sure the AP501 is built rock-solid.

Using robotic arms and fingers, cycle tests are conducted to ensure the lock’s durability. There are 2 types of cycle tests.

First, a set of robotic arms and fingers simulate a typical human use of the lock. They raise the keypad cover, enter the passcode, and lower the keypad cover to retract the throwbolt. They then press the Open/Close button to extend the throwbolt. (If you use the Auto Lock feature, you would not have to manually press the Open/Close button; the lock will automatically engage within 2 seconds of door closure.) This cycle test is repeated every 4 seconds.

The second cycle test involves just the deadbolt latch and the motor where they are repeatedly “cycled” extending and retracting the throwbolt every 4 seconds.

The AP501 has been tested to more than 300,000 cycles. If you open the door 10 times a day, it would take more than 80 years to reach 300,000 cycles.