Power Supply Mode: Usb Power Supply; 5V Power Supply. Power Supply: No Adapter DC Wire: The Product Is Equipped With 1 M DC Wire At The Factory. Built-in Battery: Factory With A CR2032 Battery. Product Size: 21.5*4.5*9.8cm Color Box Size: 24.5*5*10.2cm Single Product Weight: 210g/set   The Product Has Its Own CR2032 Battery. The Button Cell Is Used To Remember The Time When The Power Is Cut Off, Which Is Equivalent To Plugging In The Power After The Power Is Cut Off Without Resetting The Time. Specifications: ★LED Time Display ★Display Time, Date, Temperature, Alarm ★Temperature Range 0 ℃-50 ℃(32F-122F) ★Brightness Automatic Dimming Function/manual Dimming Function ★4 Keys SET UP DOWN RESET ★Date: January 1, 2000-December 31, 2099; Boot Default January 1, 2020 ★LED Screen Automatically For Time, Date, Temperature Conversion ★AL1,AL2,AL3 Three Groups Of Alarm Clock ★Power Supply Mode: Memory Battery CR2032, Working Power Supply Is DC5V DC Power Supply ★Can Be Put On The Desktop Or Wall To Use Package Included: 1 Set *(1 Alarm Clock, 1 Charging Line, 1 Button Battery, 1 Manual)