Made of ABS material, strong, accuracy, safe and durables in use. Contact keypad password lock, no keys needed. Cool to use. Factory state: Management password: 1234, default home mode, When the green is unlocked, the indicator light be on, and if the password is wrong, it sound. Applicable to agent, school, SPA/sauna bath center, swimming pool, gymnasium,golf course, supermarket, hotel, company, factory, household, business clue etc. Battery:button battery (included) Instructions: Enable public mode 1. Enter the correct management password "****+OK" key, the buzzer "di..." a long beep, the unlocking light is always on. 2. the OK button again for more than 2 seconds, the lock flashes, the OK button again. 3. Enter the numbers "4, 4" and the "OK" button, "di .." a long beep. Set temporary password 1. the OK button, the unlock indicator flashes. 2. Enter the 4~15 password to be set. 3. the OK button, the buzzer beep for a long time, and the lock be opened and stored. The temporary password is set successfully. After entering the standby state, the light of the electronic lock flash every 3 seconds. The temporary password can only be used effectively once, and it automatically become invalid after use. Turn off public mode 1. Enter the correct management password "+OK" key buzzer "di..." a long beep, the unlocking light is always on. 2. the "OK" button again for more than 2 seconds, the lock flashes, the OK button again. 3. Enter the numbers "4, 3" and the "OK" button, a long beep "di...". Maximum installation thickness: L = 20mm Colour: black Material: ABS Size: 95 x 33 mm Package Contents: 4 * Code Security Lock 4 * Mounting panel 4 * Mounting nut 4 * Mounting screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.