Whether capturing images in the studio or on location, the Vello FreeWave Wireless Remote Shutter Release adds flexibility and versatility to your shooting style. This particular FreeWave unit is compatible with cameras with a mini-USB connection, i.e. Nikon D90, D3100, D5000 and D7000 DSLRs.This versatile shutter release features Smart Code technology which allows it to be configured to operate on up to 16 million possible radio channels. You can easily switch channels to "zero in" on a frequency that provides optimal range and functionality. Compatibility Nikon: D90, D3100, D5000, D5100 and D7000 Smart Code The FreeWave"s Smart Code feature allows you to operate on 16,000,000 possible radio channels. No DIP switches need to be set, and one transmitter can trigger multiple receivers. The units have been synchronized at the factory, so your system can work right out of the box. However, to maximize signal quality and range, it is best to use the Smart Code technology to sense the "quiet" frequencies in your environment and re-synchronize on that channel. Extended Range The FreeWave can fire the camera"s shutter from distances up to 320 feet (100 meters). Multi-function Trigger your camera wirelessly or wired. Wired triggering even works if the receiver battery is dead or missing. Dual-Function Release Press the transmitter"s button half way to focus; press it fully to trigger the shutter. Delayed Release The two-second delay function gives you extra time to get into position. Multi-exposure You can take multiple shots with one press of the trigger. Long Exposures With the FreeWave you can control the length of the exposure remotely. LED Indicators Two LED indicators confirm pre-focus and exposure when in the wireless mode. Versatile