Product Features: 1. Fully submersible. 2. Universal heater for marine, freshwater or tropical aquariums A power indicator light turns on when the unit is heating, Can be positioned at a vertical or horizontal angle. Can be used in fresh or saltwater fish tanks. ERROR CODE: ER-Automatically turn off the power when leaving the water EE-normal temperature alarm H1-temperature sensor 1 short circuit fault H2-temperature sensor 2 short circuit fault E1-temperature sensor 1 open circuit failure E2-temperature sensor 2 open circuit failure E3- Relay bonding failure E4 - overvoltage fault Size: 300W-24CM,500W-24CM,800W-27CM,1000W-27CM,1200W-27CM Package contains ·1 x heater with 2 x suckers ►After receiving the goods, if there are any missing parts, please contact us in time, we will resend it to you as soon as possible. ►Because of different spotlights and different screen colors, actual objects may have a certain color difference, which is normal ►Manual measurement of product size may have an error of 1-3cm, and the delivery time is usually 10-25 days. ►If you have not received your order within 30 days, please contact us in time. If you are not satisfied with the product, please contact us and we will be happy to help you. If you are satisfied with our products, please remember to give us 5 stars.