Made of ABS material, strong, accurate, safe and durable in use. Contact keypad password lock, no keys needed, easy to use. Factory default: Management password: 1234, default home mode. When unlocked, the green indicator light is on; if password is wrong, it will sound. Applicable to offices, schools, SPA/sauna bath centers, swimming pools, gymnasiums, golf courses, supermarkets, hotels, companies, factories, households, businesses, etc. Battery: button battery (included). Instructions: Enable public mode: 1. Enter correct management password "****+OK" key, buzzer beeps long, unlocking light stays on. 2. Press OK button again for over 2 seconds, lock flashes, press OK again. 3. Enter numbers "4,4" and press the "OK" button, long beep. Set temporary password: 1. Press the OK button, the unlock indicator flashes. 2. Enter the 4~15 password to be set. 3. Press the OK button, the buzzer will beep for a long time, and the lock will be opened and stored. The temporary password is only valid once and automatically invalid after use. Turn off public mode: 1. Enter the correct management password "+OK" key, buzzer beeps long, unlocking light stays on. 2. Press the "OK" button again for over 2 seconds, lock flashes, press OK again. 3. Enter numbers "4,3" and press the "OK" button, long beep. Maximum installation thickness: L=20mm. Color: as shown. Material: ABS. Size: 95 x 33 mm. Package Contents: 1 * Code Security Lock, 1 * Mounting panel, 1 * Mounting nut, 1 * Mounting screws. Only the above package content, other products are not included. Note: Light 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.