The Calypso Instruments Ultrasonic Portable Mini features a fully integrated power system designed for wireless operation. It is powered by a single internal rechargeable battery that eliminates the need for user-replaceable disposables. The device utilizes wireless QI charging, meaning it can be powered up by placing it on a standard charging pad, which is typically included in the box. Calypso Instruments Ultrasonic Portable Mini All in One Handheld Wind Meter CMI1050