RD-J combination lock

combination lock RD-J electronic code lock for a stand alone use for all kinds of doors in residential apartments and office buildings. Main features: 1) Novel and noble appearance 2) Simple installation, opened by code 3) Uses standby key to open lock for emergency occasions 4) When in low power supply, supply (6V DC) to the power jack to activate the lock 5) 10 groups of code from 1 up to 13-bit digits available 6) Single or double code functions for anti-theft protection 7) Alert for wrong code insert 8) Up-to-date material for stable and durable performance Technical parameters: 1) Suitable for door thickness: 35 50mm² 2) Power supply: 4 LR6 (AM3, AA) 1.5V alkaline batteries 3) Service life of battery: approx. 20,000 times 4) It will alarm for low power supply, and still can open for approx. 50 times 5) Dimensions: 230 x 167 x 142mm 6) Patent no.: ZL 003 09335.2 Packing: 8pcs/ctn Carton dimensions: 47.5 x 35 x 30cm Weight: 18kg/ctn