Working temperature: 040 Working humidity(RH): 20% ~ 80% Specification: Screen: 2.8inch Color Screen User Capacity: 1, 000 Fingerprint Capacity: 1, 000 Card Capacity(RFID 125khz): 1, 000 Password Capacity: 1, 000 Storage capacity: 100, 000 Communication: Wifi, TCP/IP, U-Host/Client(USB2.0) Back up Battery(optional): 2000mAh Recognition way: Fingerprint, Card, Password Recognition ways: 1: 1, 1: N Standard Functions: Self-Service Query, T9 input, 9 Digits User ID, Schedule Bell Software: Free Menu: English or Spanish FRR: 1% FAR: 0.0001% Working voltage: DC5V1A Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, the , the Philippines, Taiwan and so on. voltage: AC100-240V Material: ABS colour: silver Package Contents: 1 x time attendance system clock 1 x Adapter 1 x USB Line 1 x Mounting Accessories 1 x English instructions 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.