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 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 2.4GHz frequency is suitable in most countries and guarantees high speed, distance and stability. Within capacious areas, the 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 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 2.4GHz 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 : Up to 45hours (); up 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)