The item must use with the "Transmitter" together. * Receiver compatible with the device under flash trigger mode:Sony: HVL-F58AM, HVL-F56AM, HVL-F42AM, HVL-F36AM. Compatible with other brands flash (Wake up can only used in TTL Compatible flash) * In wireless Remote Control mode: (1) with CL-S1 plug: compatible with Sony a900. a700, a550, a500, a450, a350, a330, a300, a230, a200, a100" Konica Minolta Dynax : 7D, 5D, DiMAGE 9, 7HL 7U 7, 5, 4X, 3. Note: The receiver can not be connected directly to hot shoe on Sony camera, but it does not affect any functions. * The functions of this Solider include solo/grouping trigger function and shutter remote function. The grouping trigger can be set either group to operate on the transmitter.It can support the shutter speed up to 1/320s(The sync speed will be different for Various combination of camera and flash ). Solider is been used world wide as free 2.4GHz frequency.It can be set the channel by cross-over point which has a stronger anti-interference ability. This product is be used as FSK modulation which is more stabilize. Unique power saving method that can save more battery life for both the transmitter and receiver.