Wireless Remote Flash Trigger N3 for Nikon D90 D600 D3000 D5000 D7000 Features: The new RF-603 II is improved version of RF-603, it is a remote shutter release as well as a multi-functional flash trigger which can synchronously trigger flashes and studio strobes. Through the transceiver based system each item can be used flexibly as trigger or receiver. Only 2 AAA batteries are required as power source for each item. The 2.4GHz wireless frequency is suitable in most countries and guarantees high speed, distance and stability. Within capacious areas, the remote control distance may reach to 100m. The synchronization speed can reach to 1/320, depending on the situation. Improved features: 1. Hot shoe locking system to prevent from slipping off; 2. Switch on side for easy operation; 3. Enhanced self-detecting system; Functions: Supports single contact triggering. Can achieve wired and wireless remote shutter release function.