Features: 1) With blue LCD display 2) Capacity: 50 Fingerprints 3) It could record and search the opening history 4) The controller could add or delete any guest\'\'s fingerprint he chooses 5) Stainless steel, never wear or tear 6) With false key 7) With LFR3 optical fingerprint sensor 8) Simple installation 9) Performance index 10) Operating voltage: 4 x 1.5V AA battery 11) Power peak value: 1W, 0.5W average 12) Identify speed: less than 2 seconds 13) False rejection rate(FRR): 1/1000 14) False acceptance rate(FAR): 1/1000000 Packing: standard export carton