JJC JM-II Radio Frequency Wireless Shutter is designed for cameras that has a remote shutter socket. The system works at a 433MHZ frequency and has 16 available channels. In addition, this wireless remote system adopts a technology to allow the transmitter trigger the receiver without direct line of sight up to 30 meters. The receiver itself with the connecting cable can be used as a Wired Remote Switch, then half press to focus, full press to take a photo. Multi-function: *Trigger your camera wireless or wired. *Wireless function supports five modes: single shot, 5 seconds delay shot, 3 continuous shots, unlimited continuous shots and bulb shot. *Wired triggering allows you half press to focus, fully press to take photo, and wired triggering works even if the receiver battery is dead or missing. Specification: *Frequency:16 Possible Radio Channels over 433MHz *Dual-Function Release:Press the transmitter"s button half way to focus; press it fully to trigger the shutter. *Delayed Release:The delay function gives you extra time to get into position. *Long Exposures:With the JM-II you can control the length of the exposure remotely. *LED Indicators:Two LED indicators confirm pre-focus and exposure when in the wireless mode. Compatibility: Sigma dp1 Quattro dp2 Quattro dp3 Quattro Camera Replaces CR-31 Package Including: JJC Transmitter x1 JJC Receiver x1 JJC Cable-I2 x1