Zkteco k40 biometric fingerprint time attendance device and access control terminal can connect third-party electric lock and exit button. the 2.8 TFT screen can display more information vividly, including finger image and verification results, etc. most importantly the Zydeco k40 fingerprint time attendance devices come with inbuilt battery backup. this biometric fingerprint time attendance also comes with free attendance management software zk time 5 which helps you to view time attendance records. PARAMETERfingerprint capacity:1000 (2000 without SSR )Id card capacity:1000 (optional)record capacity: 80, 000display : 2.8-inch TFT screencommunication: TCP/IP, USB hoststandard functions: wdms, web server, SMS, automatic status switch, self-service query, work code, t9input, 9 digits user id, DST, schedule bell. verification speed: ≤0.5 secoperating temp. :0 °c- 45 °coperating humidity 20%-80%dimension : 184 × 136 × 37.6