Digital Door Knob,Keyless Entry Door Knob,Smart Knob Unlock by Passcode/USB Backup,Exterior Door Lock with Keypad,Security Door Lock Electronic Door Knob for Home Office Bedroom Hotel Apartment,Black Our BrushSync technology tracks how

Our BrushSync technology tracks how long you've been using your RFID-enabled brush head and beeps while activating the reminder light when it’s time to replace your brush head

Excellent condition may show minimal wear from use less than 2 weeks

provides a much broader view

LONGER BATTERY LIFE: The newly designed battery takes only 2

For an extra level of protection and to keep the lens clean

Digital Door Knob,Keyless Entry Door Knob,Smart Knob Unlock by Passcode/USB Backup,Exterior Door Lock with Keypad,Security Door Lock Electronic Door Knob for Home Office Bedroom Hotel Apartment,Black Our BrushSync technology tracks how[CONVENIENT UNLOCK MODES]Keypad knob supports 2 unlock modes: passcodes and USB backup. The number of available passwords equipped with the keyboard : 100. The door lock is equipped with a USB emergency power interface. When the battery runs out, you can connect the power bank to open the door. The keypad door lock operates on 4 AAA batteries(not included) that will last up 1 year. [MULTI FUNCTION]Admin&User mode: Convenient password management for