1. Quartz explosion-proof material is safe to use. 2. Automatic constant temperature and high temperature protection. 3. External temperature regulation, temperature control range: 18-34. 4. Small size, 52mm long heating rod, as big as the thumb, more beautiful. 5. USB plug can be connected to the mobile phone charger or the charging bank. The water level can be as low as 2cm and can be used by both fish and . It can be used in fresh water, seawater fish tanks, pet feeders, etc. Protective Measures: Turn off The Electricity when Disconnected from Water: The Heating Rod Is Exposed to The Water "E1" Is Displayed, The Heater Stops Working. Over Temperature Protection: If The Water Temperature Exceeds 36, "H1" Is Displayed To Stop Heating. Dry Burning Protection: The Heating Rod Leaves The Water Or The Is Too Dirty, "H2" Is Displayed And The Tricolor Lamp Lights Up In Yellow. Specification: Power:10W Input power:5V/2A Main body size:2.5x5.6cm Length of power line:1. Suitable for:About 2L water capacity Temperature control range:18-34 Scope of use: Small fish tank/pet water dispenser Note: 1. This product is suitable for 2L water capacity. 2. Be sure to use 5V2A charger for power supply. If you use a charger with insufficient current, the flash screen will not be heated. 3. Two heating rods can be used in one fish tank to increase the heating capacity, for example, two heating rods can be used simultaneously in a fish tank with 4L water capacity. 4. However, only one heating rod can be used at the same time when one charger or power pack has multiple USB ports, otherwise it will cause heating failure or poor heating effect. Colour:Black Material:Plastic Package Contents: 1 * Aquarium Fish Tank Rod Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.