The unit has a 5-1-1 programming system with six periods per day. Perfect for the house that applied radiant floor 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. Great for the building that applied in-floor heating system. 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: 16A 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: 168g / 5.92oz Package Weight: 266g / 9.38oz Packing List: 1 * Thermostat 2 * Screw 1 * User Manual 1 * External Sensor