No outlet? No problem. Designed for use with the Game Ready GRPro 2.1 Therapy System Rechargeable Battery Pack, this Battery Pack Cable is the addition you want or replacement you need to take Game Ready therapy on the go. The cable serves two purposes. First to connect the adapter to the battery to charge and then second, to connect the battery to the Game Ready Control Unit. Please note, this is the Rechargeable Battery Pack Cable only. Rechargeable Battery, Wraps, Control Unit and additional Game Ready accessories are available separately. The rechargeable battery ensures continuation of treatment when an outlet is inconvenient or can't be found. Battery packs typically provide up to 7 hours of portable power. Cable allows battery to fully charge in just a few hours. LED power meter instantly informs user of remaining power at just the push of a button. The adapter will display a green light during the charge cycle. Once all four LED lights turn blue on the battery, the battery is fully charged.