Dual-Power Supply: RovyVon brings the idea of hybrid to the led flashlight market, The E1 keychain flashlight equipped with a built-in Lipo battery(included) and also compatible with the external triple A replaceable battery, offering more flexibility USB C Rechargeable: This edc flashlight usb c comes with a USB C charging port can be fully charged through any USB port, such as computer, mobile power supply, car charger, etc, and fully charged in 90 minutes.Suitable for outdoors, daily carry, camping, etc