Electronic 2016 New Indoor Outdoor Mini LCD Digital Home Fridge Freezer Aquarium Fish Tank Thermometer Temperature Meter Clock w/ Probe Inside sensor and outside flexible sensor equipped, test both indoor and outdoor temperature. Indoor Temperature:-10C--+50C (+14F-- +122F) Outdoor Temperature:-50C--+70C (-58F-- +158F) Power supply: 1 * 1.5V AG13 battery (not included) Can be used in car, home, office, etc.