The System Case is designed for environments like fire, EMS, military and heavy industry, or anywhere aggressive use is expected. It’s made of durable plastic to protect the FRx and its accessories. The Auto-on feature enables FRx to power up when the carry case lid is opened. The FRx Fast Response Kit fits conveniently in the lid of the case. There are specific storage places for optional spare pads, a spare battery, and the Infant/Child key. The FRx’s flashing Green Ready Light can be easily seen through the clear window without having to open the case.