YukiHalu USB Powered Submersible Aquarium Heater, 10W/5V/2A Adapter, Mini Fish Tank Heater 10W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 0.5-1 Gallon Tank

• 【Super Mini Size, 10Watt, below 1 Gallon】YukiHalu 10W aquarium heater is designed for the mini fish tanks less than 1 gallon. Compact design, take less space in the fish tank, easy to hide in the tank. Temperature can be accurately adjusted from 64 to 93°F. The rated voltage DC 5V/2A. Important tips: insufficient power of the adapter will cause no heating and the number will flash or the controller restarts repeatedly, make sure the power adapter is 5V 2A and has enough power.
• 【Automatic Constant Temperature with 1℉ Accuracy】Thanks to advanced Intelligent Frequency Conversion Technology, the water temperature can be kept constant with an accuracy of 1℉. The heater's working frequency will be changed according to temperature variation, and the heating is automatically stopped when the set temperature is reached. Compare to traditional heater, this new technology will cut down 49% electricity bill for you.
• 【Overheating Protection & DC 5V USB supply】The power will be cut off and stop heating automatically if the heater overheating. Protect your fish. Never cook your fish. USB 5V power supply, prevent electric shock. 30days full refund, 12-months warranty.
• 【External Temperature Controller, Never Wet Your Hands】Use an external controller to set the temperature instead of immersing your hands in water to rotate the dial. Never wet your hands or contaminating your tank. Easy to install.
• 【Built-in Thermometer, Power-off Memory Function】Dual built-in temperature sensor, the water temperature will be displayed on the external temperature controller in real time. No need to buy other aquarium thermometer. The heater will remember the temperature setting, no need to reset the temperature after power off.

Product description CAUTIONS 1, The device must be used under rated voltage 5V=2A(10W), insufficient power of the adapter will cause no heating. Make sure the adapter has enough power. 2, The heater must be fully submersed into the water. The external temperature controller must be kept away from the water as it is not waterproof. 3, Disconnect power adapter and wait for 15 minutes before changing water or remove heater. 4, Place the heater in the way of water flow and don't bury it. Products Highlight 1, Small size. It's perfect for a super mini fish tank (under 1 gallon) 2, Easy to set temperature. External temperature controller 3, Easy to read. Built-in Thermometer. Dual built-in temperature sensor. Digital LED display 4, High accuracy up to 1℉ thanks to advanced Intelligent Frequency Conversion Technology 5, Safety, 5V DC voltage, safety adapter include, and overheating protection never cook the fish. 6, Suitable for saltwater and freshwater Error codes H1: Overheating protection, stop heating automatically. other codes: contact seller to replace a new kit. Indicator lights Green: Constant Temperature Red: heating Parameters Voltage: 5V=2A(10W) Power: 10 Watts Cord length：4.2Ft Aquarium Volume: below1 Gallon Temperature Range: 18~34 °C / 64~93 ℉ Temperature Accuracy: 0.5 °C / 1 ℉ Controller:External Controller（Not waterproof） Packaging: 1×heater with external controller, 1×user manual, 1x suction cup, 1x usb adapter WARRANTY 30 days full-refund and 12 months replacement. Ingredients quartz Directions The adapter must be larger than 2Amp current (5V 2A 10W)insufficient power of the adapter will cause no heating and the number will flashes or the controller restarts repeatedly, make sure the power adapter has enough power. Safety Warning The adapter must be larger than 2Amp current (5V 2A 10W)insufficient power of the adapter will cause no heating and the number will flashes or the controller restarts repeatedly, make sure the power adapter has enough power.