This is a 7.4 volt 2000mah LiPoly Receiver Pack. Its fits the new Mugen style 1/8th scale buggies and truggies that require a small flat nimh rx pack. THIS PACK REQUIRES YOU TO DREMEL OUT A SMALL PORTION OF THE PLASTIC DIVIDER INSIDE THE BATTERY COMPARTMENT. This light weight pack provides longer run time and voltage than a standard Nimh receiver pack. Assembled in house and includes a cell balancing connector. This pack is also double shrink wrapeD to help protect the pack. YOU MUST USE A VOLTAGE REGULATOR ( LIKE OUR #BALVR1) TO PREVENT DAMAGE TO RECEIVERS AND SERVOS.