Ardwolf A20 Security High-sensitivity High-Recognition Rate Keyless Biometric Fingerprint Door Lock, Left-Handed One hole needs to be drilled while the lock is installed. So it wouldn&#039;t be a good choise if your door can not be drilled. Please confirm your door is left-handed door or right-handed door, and choose the suitable door lock for your door (Left-hand or right-handed). Before enter the user code, active the keypad by touching it; press the enter button to unlock the door after the user code. Press and hold the reset button to set the lock back to manufacturer default status when the code and fingerprint doesn&#039;t work at all For each valid entry, lock will automatically lock in 5 sec. High Speed Processor Integrated The lock is powered by the ST chip, which has 25% increase of the processing capacity. Touch screen keypad Stainless Steel as Raw Material. With a high quality black touch screen keypad, there is no more worry about leaving the fingermark on the screen. Stainless steel (304 grade) is purposely designed to absorb more energy without breaking. The stronger resistance to corrosion keeps a longer life time for the finish. Front Plate (Outside Plate) (WxHxD): 68x210x29.8mm, Stainless steel forging casting Back Plate (Inside Plate) (WxHxD): 68x210x29.8mm, Stainless steel forging casting Battery: (4 AA Alkaline of 1.5V, not included) 5,000~6,000 times Rated Voltage: DC 6V Operating Temperature: -15 centigrades~55 centigrade Type of Fingerprint Sensor: Optical Wake Up Time: 400ms Fingerprint Input Method: Optical capture User Capacity: 100 fingerprints and 100 user codes Fake Finger: No recognition( Silicon Material) FAR%/FRR%: 0.001/0.01 Capture Speed: 39cm/s