Hygger compact oval shape aquarium heater, is specially designed for small fish tanks use, for betta or turtles. <br>With a plastic guard, gaps width on it is about 6-7mm, no fish can go in, so no worries for fish stuck or burned.<br> <b>Other features of the fish tank heater:</b><br> 1. Compact and small<br> 2. Fast heating and reliable<br> 3. With 2 strong suction cups<br> 4. External temp controller<br> 5. Built-in thermometer<br> 6. Led digital display<br> 7. Auto shut off when out of water<br> 8. Over temperature protection<br><br> The aquarium submersible heater is suitable for use in fresh water and saltwater, can be used for almost all kinds of small fish tanks,<br> such as square, cylinder shaped or bowl tank, tank made of glass, acrylic or plastic.<br><br> <b>How to use the temperature setting?</b><br> Please press the button on the controller over and over, the set temp digits will go circularly from 63 to 93, when you set it to the digit<br> you want, stop and wait the led flashing for 3 times, then the setting is done and the led will go on display the water temp.<br><br> <b>LED digital display</b><br> Digits: water temp/set temp<br> E1: heater is out of water<br> HH: water temp is over 95℉<br><br> <b>Use directions</b><br> 1. Keep the heater fully submerged in water.<br> 2. Don’t bury the heater under substrates such as gravels or sands.<br> 3. Keep the external temp controller away form water.<br> 4. Don’t take the heater out of water directly when it’s heating.<br> 5. Keep water circulation as far as possible.<br><br> <b>Specification:</b><br> Voltage: 110-120V/60HZ<br> Heater tube material: quartz glass<br> Plug: two-pin US plug<br> Power cord: 5ft<br> Dimension: 2.7x1.4x 4.5 inch<br> Temp control range: 63-94℉<br> Size: 50W (1-6.5 gallon), 100W (6.5-13 gallon)