Wirelessly shutter off. The wireless shutter release RFN-4 transmitter is sold alone, the receiver itself, and the 7 types of replacement cables. A single unit of a wireless shutter transmitter, receiver and replacement cable that uses a 2.4 GHz radio wave. The maximum reach distance is 27.6 ft (80 m) when combined with the RFN-4S. (The distance will vary depending on the situation and environment. Japan Radio Law Technology Compliant Certification Number 007-AB0020. Smaller than the previous RFN-2400 model and lower price. It can be set to 16 ch to prevent malfunctions caused by interference. The transmitter (transmitter) has an alarm function that allows you to check the reception operation on the camera side. It also supports bulb shooting. The receiver (receiver) is equipped with a shutter button and can also be used as a wired remote. The receiver can be attached to the cameras hot shoe, and it is a clip type so it can be attached to a strap or other device. The RFN-4S-RX is a small type for some Nikon models that can be powered from the camera side.