The RadioPopper Nano Receiver is part of a wireless radio triggering system that can fire your flash at distances up to 1,750' depending on the prevailing conditions. The 4-channel Nano receiver features simple push button operation and is compatible with any flash with shoe mount or a PC outlet via included 3.5 mm sync cord. DSLRs can sync up to 1/250 second and leaf shutter cameras up to 1/500 second. The Nano gets approximately 75-100 hours of running time from the single, included CR123A battery. An LED gauge indicates remaining power. It requires separate purchase of a Nano, PX or JrX transmitter for use.