SOBO USB Aquarium Mini Heater 10W with External Controller, Adjustable Fish Tank Heater for Betta, Fighting Fish, Small Fresh Water and Salt Water Tanks Under 5L

MINI AQUARIUM HEATER - Compact 10W heater designed for small fish tanks under 5L / 1.3 gallons, ideal for Betta and nano aquarium setups. USB POWERED DESIGN - Runs from a 5V 2A USB power supply for convenient low-voltage operation in compact aquarium systems. EXTERNAL CONTROLLER - Adjust the temperature outside the tank without getting your hands wet, with a digital display for easy setting control. ADJUSTABLE TEMPERATURE - Temperature range from 15°C to 34°C / 59°F to 93°F, with saved temperature setting after adjustment. FRESH AND SALT WATER USE - Suitable for fresh water and salt water tanks, including small Betta tanks, guppy tanks and nano fish setups. COMPACT HEATER PROBE - Approx. 5.2cm x 2cm / 2" x 0.8" heater body with suction cup mount for secure placement inside small tanks. IMPORTANT POWER NOTE - Requires a 5V 2A USB power supply and is intended for tanks under 5L only; always use fully submerged and monitor water temperature.