Feature:1. 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.2. Through the transceiver based system each item can be used flexibly as trigger or receiver.3. Only 2 AAA batteries are required as power source for each item.4. 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.5. The synchronization speed can reach to 1/320, depending on the situation.Specification: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 off2. Switch on side for easy operation3. Enhanced self-detecting systemFunctions: Supports single contact triggering.Can achieve wired and wireless remote shutter release function.Flash Trigger: to fire the Flash Speedlite; to fire the Studio Strobe light (You need to purchase an extra 6.35mm cable to fulfill this function).You can use ABOVE TWO FUNCTIONS simultaneously.This listing is for N1 version: For Nikon D1 D2 series D3 D4 series D200 D300 D700 D800 Specifications:Type: FSK 2.4GHz wireless remote sustemTransmitter distance: 100MChannel: 16 channelsRelease: half-way press, full-way pressReceiver interface: one is 2.5mm socketStudio flash light interface: Standard PC socketBattery type: 2 * AAA (not included)Stand-by time: Up to 45hours (TRX); up to 400hours (TX)Item size: 80.7 * 31.3 * 25.9mm / 3.2 * 1.2 * 1.0inItem weight: 44g/ 1.6oz (each)Package size: 16 * 9 * 4.5cm / 6.3 * 3.5 * 1.8inPackage weight: 170g / 6.0oz Package List:1 * Tranceiver1 * Receiver1 * Shutter connecting calbe N11 * Manual (English)Package List:1 * Tranceiver1 * Receiver1 * Shutter connecting calbe N11 * Manual (English)