Main feature: ◆ capacity: 50 Fingerprints ◆ "Touch-open"technology with dead lock inside ◆ 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