Big Joe Stomp Box Company PB-107 Power Box Lithium | 9v 500mA Rechargeable Lithium Battery Pedal Power Supply 9v 500ma Lithium Battery Power Supply capable of powering multiple pedals, pedal boards and high current draw effects Innovative, Smart Battery, display technology shows current draw, battery status and time remaining 3.25 x 1.625 x 1.25 inches