Item Type: Aquarium Digital Thermometer Material: ABS Plastic Battery Type: 1 x 3.7V Lithium Battery Battery Model: 401020 Battery Capacity: 55mAh (Shipped with Built in Battery) 1¡¢ACCURATE DESIGN: Aquarium digital thermometer has built in high accuracy temperature sensor, which is precise and sensitive to help you better control the temperature of your fish tank. 2¡¢USB RECHARGEABLE: LED display aquarium thermometer is designed with rechargeable, built in 55mAh lithium battery, long life and can be used for many times. 3¡¢COMPACT AND LIGHTWEIGHT: LED aquarium thermometer is compact and convenient, does not take up much space, suitable for most fish tanks and aquariums. 4¡¢BACK ADHESIVE: Aquarium thermometer comes with a nonmarking back adhesive, which can be attached to the outside wall of the fish tank at will, the adhesive is firm and does not fall off easily. 5¡¢TOUCH SCREEN: Fish tank thermometer is designed with touch screen, touch control, touch to display the temperature value, one button to switch on and off. 1 x Thermometer 1 x Charging Cable