PLEASE TAKE NOTE: This product is not designed to be battery powered. it need use usb cable to plug in This battery is just a time memory battery. Please pay attention to this. Thank you Product category: wall clock/ table clock Special functions: Time/Date/Temperature/Alarm clock by turn Power: 1X CR2032 For Memory Time, DC 5v USB Cable Operation Manual A: Clock Function: Default 12 Hour Format, Under Time SettingMode, Press UP Key To Choose 12/24Hr Display. B: Under Time Display Mode: L ong Press SET Key 2 Seconds IntoClock Setting, Press UP/DOWN To Adjust. L ong Press To Be FastAdjustment. Setting Order: 12/24Hr - Hour - Minute - Save & Exit.C: Date Function: Under Date Mode, Just Display Monthl Date, ToCheck Which Year Under Date Setting Mode. Under Date Mode, Long Press Set Key Into Date Setting, PressUP/DOWN to Adjust, Long Press UP/DOWN To Fast Adjustable. Year Adjustable Range: 2000-2099, Beyond 2099 Then Back To 2000.D: Alarm Function: Total 3 Alarms: AL1, AL2, AL3. Under Alarm Mode, Press UP To Choose AL ON/OFF, Long Press Setkey Into Alarm Setting, Setting Order: Hour - Minute - Save & Exit. When Alarm Ring, Press Any Key to Stop Alarm, If Non-Operation, WillRing For 1 Minute, Sound BIBI I Second. Auto Brightness Adjustable: Brightness 70% darker form 7PM---5:59PM. 100% Brightness Light form 6AM---6:59PM Voice Control: in normal mode, only DOWN is used to open the power saving mode, ON SD is used to open the power saving mode, and --SD is used to sace the power. POWER model switch. ON SD, turn off the LED display 15S later. When the sound reaches 75dB, the LED is re-lit for 15 Seconds. Shell material: plastic Waterproof: no Applicable place: living room, bedroom, study, office Size: 21.5 * 4.5 * 9.8 CM Space: living room, bedroom, study, outdoor, dining room, porch, balcony, commercial space Power type: usb cable Style: European Package included: 1 x LED clock 1 x Memory Battery 1 x USB cable 1 x User manual Brighness can,t adjust/ Just Auto