Specifications: Material: PC, Copper Color: Black Frequency: 50 - 60HZ Remote Control Battery: 2 x AAA Battery (Not Included) Weight: Approx. 1700g Size: Approx. 24x13.5x6.5cm Wire Requirements: ≥ 2.5㎡ copper core wire Air Switch Requirements: ≥ 32A Water Pressure: tap water basically meets the requirements, booster pump can be added if it is too small. Operation: Press the shutdown key for 6 seconds, it will automatically switch to gear mode, and then press 6 seconds to frequency conversion mode. Frequency Conversion Mode: Only needs to set the temperature, and the system automatically changes the output power to reach the set temperature, more convenient and the setting more intuitive. Gear Mode: the gear has 4 gears, and the fixed power of each gear is 1500 / 3000W, respectively P1 / P2 1 to 2 gears. The gear can be controlled by people, the system needn't to calculate power, the low gear can be used in spring, summer and autumn. If the home wire is less than 2.5㎡ copper core, the gear mode can be adopted, and gear 1 to 2 can also meet the needs of ordinary washing, and the low gear can be used to control the power to prevent the wire from burning. Package Includes: 1 x Water Heater 1 x Instruction Manual 1 x Remote Control (Battery Not Included) 1 x Remote Control Bracket 2 x Bag of Screw and Screw Sleeve Note: Pre sale test: Each machine has been tested with water and electricity. Do not misunderstand the residual water. Water pressure: the water tower of the water tank or the household with very small water output should be considered carefully. The machine may not be heated. Water supply is required for first use, and power on heating is allowed only after the water outlet is smooth. It doesn't matter later. Different inlet water temperature and pressure will result in different effect of each household.