No lock hole design, completely eliminating traditional keys and locks, allowing for full control via remote, ensuring real security. lock method provides enhanced safety and stability. Absence of keyholes outside prevents unauthorized access by thieves. USB external power source function ensures the lock operates even when the battery is dead (battery not included). Easy installation on all types of doors, making it very convenient. This innovative lock system operates on 2 AA batteries (not included) and utilizes a transmission frequency of 433MHZ (±500KHZ). It has an operation range of up to 10 meters without obstacles. The unlocking modes include remote control and an indoor emergency button, with the capability to connect up to 16 controllers (not included). Enjoy the convenience and security of this advanced locking solution. Color: Silver Material: Zinc ABS Package Contents: 1* Lock 1* Lock Body Holder 1* Lock Catch 1* USB Power Cable 4* Remote Keys 1* Bag of 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.