Feature: 1. Fast Heating: Alloy heating plate, fast heating, safe and stable, intelligent temperature control system, 1 hour heating, 3 hours constant temperature. 2. Variable Frequency: PID temperature control algorithm, realizing high heat and low power consumption, using intelligent frequency conversion technology, the power size is freely adjusted by the chip, soft temperature control. 3. EASY TO CONTROL: Dual temperature sensing probes, real time monitoring of the cylinder, separated cylinder outside controller, one key to control the temperature. 4. Digital Display: High definition LED display, accurately monitor the temperature day and night, real time easy to grasp the current fish tank temperature. 5. Easy to Use and Clean: AI intelligent heating, removable and easy to clean, convenient for long term maintenance, power off immediately when leaving the water surface during heating work. Specification: Item Type: Automatic Aquarium Heater Material: ABS Use: Fish Tank Automatic Thermostat Suitable for Water Volume: Below 400L Suitable for Fish Tank: 100‑120CM/3.3-3.9ft. Package List: 1 x Heater1 x Fixing Clips1 x Instruction Manual