available to display time, date, temperature, humidity; low power consumption 1. Dimension: 160×53mm 2. Operation voltage: DC 740V 3. Time precision: Daily deviation≤3 Secs 4. Operation temp: -10 ~ 70 degree in celsius, 5. Operation humidity: 0 ~ 90% 6. Low power consumption, the power rating is less than 1 Watt; 7. To meet the environmental protection request: the main components of device are certified by RoHS approval; 8. Digits: 38mm in height, red 4-digit LED 7-segment style; 9. Display format: HH:MM (12h/24h is optional) 10. With 3 buttons for time setting and reset; 11. With cell button battery, which can keep time running for 5 years when no DC power supply.