Short Answer: The AlphaSonic charges on a USB cord that can be plugged into any USB port. Battery life depends on how the device is being used.
Long Answer: Recharge your AlphaSonic by plugging the USB cord into any USB port. A red light will appear on the control panel and will turn off when the device is fully charged. You may also use it while it is being charged. The battery life will vary depending on the settings and number of transducers being used. All units are “seasoned” before being shipped to help ensure their longest run times.