Classic Aquarium Heater For Fish Tank And Turtle 50W (Y1 50W) USB Cable Adapter Strong Worm Gear Design: The Strong Worm Gear Design: The through hole structure and high torque mechanism provide secure clamping pressure and a dependable seal around hoses and fittings the gold pushpins are reliable and sturdy to insert directly choose a larger size when the air temperature is 10 degrees lower than the set temperature Over temperature protection Saving: Save electricity: Automatically turn off and on depending on the temperature European plug and the delivery timeframes (excluding weekends and public holidays) are as follows: