Feature: 1. [Power Failure Memory] The aquarium external heater automatically restores the previous settings after a power failure, no need to set the temperature again, to avoid forgetting to adjust the temperature after a power failure, resulting in dead fish. 2. [Electricity Leakage Proof] Aquarium external heater adopts a safe overwater heating design, which really separates water and electricity and prevents the danger of leakage, creating a healthy and safe underwater environment for your fish. 3. [Fault Lifting] Fish tank external heater system fault lifting can be restored to normal, display E3 relay bonding fault even if the fault is lifted can not be restored, must press the button for more than 2 seconds to lift the fault. 4. [Accurate Temperature Control] Fish tank external heating rod built in intelligent IC chip, accurate temperature control, small temperature difference, over temperature protection system, is a safer heating rod. 5. [Waterproof And Easy To Use] Aquarium heating rod with clear LED display, easy to control and convenient to understand the working status. Outstanding airtight effect, accuracy waterproof. Has various installation methods. Specification: Item Type: External Aquarium Heater Material: Plastic Size: Approx. 88 x 73 x 185mm / 3.5 x 2.9 x 7.3in Use: Fish Tank External Heater Control Range: 20℃-34℃ Voltage Plug, Specifications: EU Plug 220V. Package List: 1 x External Aquarium Heater4 x Water Nozzle4 x Washer2 x Reinforcement Pipe2 x Fixing Hoop Note: Manual measurement, please allow some errors.