Make sure the battery is positive and negative.
Digital Fever Thermometer Non Contact & Finger Pulse Oximeter SpO2 Monitor
Digital Fever Thermometer Medisana Fever Alarm FTC Fever Thermometer
Fancysky Fever Thermometer, Cartoon Digital Fever Thermometer (Little Bear)
Infrared Fever Thermometer | Non-Contact Digital Body Temperature Ear & Forehead
