Wireless Remote Control Electronic Lock Security Invisible Keyless Entry Door Lock w/ 4 Controllers

NOTE: K key can only be locked and cannot be unlocked. Features: 1. No lock hole design, it completely abandons the traditional key and lock, in the fully opened and closed by remote control, realized the real security. 2. Extended antenna, stronger signal, safer and more responsive. 3. Add USB external power source function. Make sure the lock works when battery (not included) was dead. 4. Two unlock modes optional: Remote control unlock& indoor button unlock 5. Easy installation on all kind of doors, very convenient. Specifications: Host Machine: Power Supply: 2*AA batteries(not included) Transmission Frequency: 315MHZ(±500KHZ) Operation Range: Within 15m Unlock Mode: Remote control unlock& indoor button unlock Item Size:15.5*9.5*3.5cm Item Weight(without accessories): 534g Remote Controller: Power Supply: Lithium button battery Standard Number: 4 (included) Max Controller Number: 16 (not included) Function: Lock &unlock Item Size(Each):6*3*1cm Item Weight(Each): 25g Package Information: Package Size: Approx.22.2*19.8*5.8/8.47*7.8*2.28in Package Weight: Approx.1194g/2.63lb Package List: 1* Lock 1* Lock Body Holder 1* Lock Catch 4* Remote Keys 1* Bag of Mounting Screws 1* User Manual(English)