1. With password error alarm function, enter the wrong password four times in a row, the keyboard will be locked for 60 seconds and activate the alarm. 2. With password memory function, the original password will remain after power off and battery change. 3. With password confusion function, enter random numbers before or after the correct password to prevent others from peeking. 4. Adopts digital touch screen and digital keypad to enter password, more convenient to use. 5. Great electronic lock for agents, schools, spas/saunas, swimming pools, gymnasiums, sports grounds, supermarkets, hotels, businesses, factories and families. 6. Designed with a USB port for emergency charging unlocking. 7. Made of high strength ABS material for maximum durability. Specifications: Item Type: Electronic Combination Lock Material: ABS Color: Optional Size: L=20mm/0.8in, L=30mm/1.2in Power Supply: 1 x 3V CR2032 Button Battery (Not Included) Package List: 1 x Lock electronic combination cabinet 1 x installation accessories pack 1 x manual