Item Type: Aquarium Heater_x000D_ Material: ABS_x000D_ Use: Aquarium Automatic Thermostat Heater_x000D_ Plug Specifications, Voltage: UK Plug, 220V_x000D_ Temperature Control Range: 16-34_x000D_ Length: Approx. 23cm / 9.1in 1PID TEMPERATURE CONTROL: Aquarium heater is made of high temperature resistant ABS housing, which is robust and durable.PID temperature control algorithm, high thermal energy and low power consumption. 2EXPLOSION PROOF QUARTZ TUBE: Internal with explosion?proof quartz tube and nichrome heating wire for faster heat conduction and more stable heating to preserve fish, aquatic life and users from scalding. 3EXTERNAL CONTROLLER: Submersible aquarium heater has an external controller and is equipped with a state of the art heating chip to precisely control the temperature of the aquarium. 4INTELLIGENT INVERTER TECHNOLOGY: Using intelligent frequency conversion technology, the power size is freely adjusted by the chip, always maintaining a constant temperature at the lowest power. 5ULTRA SHORT BAR BODY: Submersible fish tank heater features an ultra short rod body, only 23cm long, with an external knob to adjust the temperature for more intuitive control.Please allow some error due to manual measurement.1 x_x000D_ _x000D_ AquariumHeater 2 x Suction Cup 1 x Instruction Book