Features:
The new -603 II is improved version of -603, it is a remote shutter release as well as a multi-functional flash trigger which can synchronously trigger flashes and strobes. 
Through the based system each item can be used flexibly as trigger or receiver. 
Only 2 AAA are required as source for each item.
The frequency is suitable in most countries and guarantees high , distance and stability. Within capacious areas, the distance may reach to 100m. 
The synchronization can reach to 1/320, depending on the situation.

Improved features:
1. Hot shoe locking system to from slipping off
2. Switch on side for easy operation
3. Enhanced self-detecting system


Functions: 
Supports triggering.
Can achieve wired and remote shutter release function.
Flash Trigger: to fire Speedlite; to fire the Strobe (You need to purchase an 6.35mm cable to fulfill this function).
You can use ABOVE TWO FUNCTIONS simultaneousty.


This listing is for N3 version: 
For Nikon D90 D600 series D5000series D7000series
 
Specifications:
Type: FSK remote sustem
distance: 100M
Channel: 16 channels
Release: half-way press, full-way press
Receiver interface: is 2.5mm socket
flash interface: Standard PC socket
type: 2 * AAA (not included)
Stand-by : to 45hours (); to 400hours (TX)
Item size: 80.7 * 31.3 * 25.9mm / 3.2 * 1.2 * 1.0in
Item weight: 44g/ 1.6oz (each)
Package size: 16 * 9 * 4.5cm / 6.3 * 3.5 * 1.8in
Package weight: 170g / 6.0oz 

Package List: D1090
1 * Tranceiver
1 * Receiver
1 * Shutter connecting calbe N3
1 * Manual (English)