Main feature: With blue LCD display capacity: 50 Fingerprints It could record and search the opening history. The controller could add or delete any guest?s fingerprint he chooses. Stainless steel, never wear or tear with false key with LFR3 optical fingerprint sensor Simple installation Performance index Operating voltage ：4?1.5V　AA battery power peak value：1W，0.5W average operating temperature ：（out ）－10°C－75°C　 (inner)0°C－60°C identify speed :less than 2 seconds False rejection rate: 1/1000 False acceptance rate: 1/1000000