Features: Configuration of large screen LCD display, data display clear and accurate, easy to observe. The casing is made of high quality flame retardant material PC+ABS, durable, wear resistant and high temperature resistant. High reliability single-chip computer, strong anti-interference, safe and reliable. It is easy to operate by touching keys and setting different working modes by keys. Terminal wiring, relay output, timing switch can be selected. It has the function of temperature calibration and anti-freezing. Indoor temperature controller adopts the technology of micro-computer control to control the start and stop of heating equipment by relay based on the comparison results of indoor temperature and set temperature, so as to achieve the goal of indoor constant temperature and energy saving. Specification: Condition: 100% Brand New Material: Tempered Glass, PC+ABS Load Current: 3A (Water Heating), 16A (Electric Heating) Temperature Control Accuracy: ±0.5°C Set Temperature Range: 5°C - 35°C Temperature Limit Range: 5-99 ° C Self-Consumption Power: <0.3W Temperature Sensor: NTC Weight: Approx. 230g / 8.1oz Size: Approx. 8.5x8.5x4cm / 3.3x3.3x1.6in How To Use: 1. Open main control panel, with 3.5mm slotted point screwdriver along the inclined plane until to card depths of 4mm, pry up slightly to open the card hook. 2. Connect back panel and power, wire as per wiring diagram, fasten back pand on cassette with M4 screw. 3. Connect winding displacement of back panel and upper panel. 4. Hang up with 30° to 2 hooks, press on the 2 bottom corners, stuck on the upper shell, installation finished. Package List: 1 x Thermostat 1 x Instruction Manual 2 x Screws Note: 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. . 3. Hysteresis (return temperature) description: the factory default of external sensor limit temperature(OSV) set as 42℃, external sensor limit temperature hysteresis(dIF) set as 2, when temperature up to 44℃, relay stop output, when temperature.drops to 40℃, relay output again and heating.(Operation when room temperature lower than setting temperature). 4. Please select internal, extemal sensor working mode correctly. If it is choose wrong or sensor is fault (breakdown), LCD interface will display "Err" , temperature controller stops heating until fault is diminated. Special Hint : Please choose when installing the cable: water heating selects 1.5-2.5mm2 rigid line; electric heating select above 2.5mm2 rigid line.