The unit has a 5-1-1 programming system with six periods per day. Perfect for the house that applied water/gas boiler heating system. Features: Flexible programming: Program up to 6 periods per day. Same schedule at the weekday, then individual for Saturday and Sunday. Accurate Control: Keeps temperature within the level you set at the accuracy of 0.5. Conversion between Celsius() or Fehrenheit() is available. And all setting's languages sychronize with your time zone, local address and language. Suitable for installation within a standard 86mm hidden junction box and European 60mm round box. Easy to Install: No batteries required, and saves setting when un-powered. Note: *Please read the user manual carefully before use. *The schedule for this thermostat can be adjusted to 5-1-1 (Monday through Friday have the same schedule, then individual for Saturday and Sunday). *For the unit with no WiFi, App and voice control are not available. Specifications: Material: PC+ABS(fireproof) Color: Black / White (optional) Connection: With WiFi / No WiFi (optional) Sensor: NTC Accuracy: ±0.5 Set Temp. Range: 5~35 Room Temp. Range: 5~99 Power Supply: 95-240V AC, 3A, 50~60Hz Power Consumptions: < 1.5W Timing Error: < 1% Current Load: 5A Ambient Temperature: 0~45, 5~95%RH (non-condensing) Storage Temperature: -5~55 Installation Hole Distance: 60mm Item Size: 8.6*8.6*3.9cm / 3.38*3.38*1.53in Package Size: 10.5*9*5.8cm / 4.13*3.54*2.28in Item Weight: 157g / 5.53oz Package Weight: 211g / 7.44oz Packing List: 1 * Thermostat 2 * Screw 1 * User Manual