Portable: Just A Little Bigger Than A Fingernail Cap, You Can Always Keep It In Your Purse Or Car. Usb Charging: As Long As There Is a Usb Port Charger Or Computer Usb Port, It Can Be Charged.It Is Recommended To Use a 5V 1A Or Above Charger, The Charging Speed Is Faster. Pairing: Can Be Used With Power Bank Or Cell Phone Charger. Short Cable: With A 9.44 Inch Short Cable, Charging Is More Free, Such As Charging In The Car, Charging Outlet Etc. Wireless Charging:Put The Watch Gently, It Can Be Sucked To Charge.