1. Same Frequency Display: Time Month Day Week Temperature 2. 12/24 Hour System Switching 3. Celsius / Fahrenheit Switching . 4. Calendar: 2000-2099. Usb-Powered Dc5v/500ma; Built-In Battery To Keep The Time Display Program Running Internally But Not Visible Time Setting 5. In Time Display Mode, Press Set Key To Enter Setting Mode, The Sequence Is Year-Month-Day-Hour-Minute. 6. Hour Setting:Press Set To Enter Hour Setting, Hour Zone Blinks, Press Up/Down To Increase/Decrease: After Hour Setting Is Complete, Press Set To Enter Minute Setting As Before. 7. After Setting The Minutes, Press Set To Return To The Time Display Screen. C/F Switching, In Normal Display Mode, Press Up To Switch The Temperature Unit C/F, 12/24 Hour System Setting, Press Down To Switch The 12/24 Hour System. Precaution. Please Use The Clock In A Dry Place, Due To All The Casing, It Can Not Be Used For A Long Time In A Place Where It Is Wet, Trembling, High Temperature Or Keep The Temperature Change. Please Use The Usb Cable Suitable For The Clock. Note: Charging Model: 8000 Mah Lithium Battery, Use Time Is About 15-20 Days (6-8 Hours To Fully Charge) Please Press The "Reset" Button Before First Use type:C:Imitation cotton linen (storage type charging) Display Type: LED Product Power Supply: Built-In Lithium Battery (Built-In 8000mah Lithium Battery) Colour:As Shown Material:MPF+PVC Size:about 195 x 25mm Package Contents: 1 x Digital Clock 1 x Chinese And English Manual 1 x Usb Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.