Waterproof and anti-theft, easy to install. All mechanical digital buttons, simple operation, no battery required, dual-use password and key, unlocking is more convenient. Triple plating process, strong corrosion resistance, waterproof and rustproof. Granular button is sensitive, good touch, easy to enter password, when you press the wrong password, press "C" to reset, then enter the correct password to unlock normally. Precisely open, you can adjust the position of the screw to change the twist direction of the handle, and adjust the channel function key to adjust the state normally open, the lock tab is retracted, and the door is closed without locking. Safe and fast, you can set passwords from 1 to 11 digits out of order, you do not need to disassemble and to lock, twist the password set switch, you can change the password. Three-year warranty, if there is any quality problem, one month worry-free return or refund your purchase. If there is any problem during use, please contact us by email, we will solve it for you in the first time, full-time available customer service.