Power-2*AAA Batteries (Not included).Easily Modes Switch: The Forehead Thermometer Is Designed For All Ages, Baby, Adults, And Elders. It Is Not Just For Thermometer Forehead But Also The Surface Thermometer. Press And Hold The Set Button For 3 Seconds, Then Press The Memo Button Or The Mode Button To Switch Between ? and ?.Fever Notification: Thermometer For Fever With A High-Temperature Alert, Quickly Prompting Abnormal Body Temperature. And It Stores 50 Measurements To Compare Body Temperature Changes. You Can Trace Your Temperature Easily.LCD Display: Digital Thermometer With Big LCD Screen Displays Sharp Readings. Instant Read Thermometer With Mute/Un-mute Mode; It Is A Good Infant Thermometer For Using In The Night. You Do Not Need To Worry About Waking Up Your Baby.No Touch Forehead 1-5CM: The Gap Between The Thermometer And The Forehead Must Be 1-5 cm. Non-Contact Thermometer, It Is Secure And Hygiene. It Is More Beneficial Than Standard Mercury Thermometer And Touch Thermometer.