Keyless Passcode Entry: The K2 can set 100 access codes for family uses, 80 codes more than others with only 20 codes in the market. One-time Code: A one-time password can be set for temporary access for visitors. One-time password will be automatically deleted after used. Smart-Locking: The K2 can be set to lock automatically in 10-99s; press and hold the LOCK / UNLOCK key on top of the keypad for 2 seconds to lock the door. Security and Privacy: The K2 has secure Anti-Peeping technology and Vacation mode, provide you 100% security for your house. Durable Lifespan: Made of solid zinc alloy and advanced oil-painted finish, IP54 Waterproof, with sturdy lock cylinder and alloy, durable and sturdy for long term use. Easy to Install: With a clear User Instruction, just need a screwdriver and few steps, it can be installed and programed all by yourself in several minutes, compatible with all left and right handed doors. note:4 AA battery-powered packages do not contain batteries. Colour:black Material:Metal Package Contents: 1 x Door lock (with mounting fittings and spare key) 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.