I never thought to look for the manufacturers website surfinrach90! Good thinking!
Theres some more info on their charger there...
Remote Charging Stand (SPC0602)
The Remote Charging Stand unit will provide a stylish and secure way to recharge your Wii Remote Controls and store your console in its vertical position.
Stores your Wii console securely in its vertical position
Built in charging docks for 2 x Wii remotes (batteries not included)
Charging bay to charge 2 x AA batteries (batteries not included)
Auto Cut Off when batteries are charged.
USB connection from your console provides power
Stylish Cool Blue LED lights
Requires 2 x AAA Ni-Mh batteries for each remote (batteries not supplied)
...and also details on a wireless sensor bar!
The Wireless Sensor Bar provides a compact and wirefree solution to enhance your gameplay. It can be positioned almost anywhere, ideally above or below your TV set, which makes it an excellent choice for wall mounted TV sets. Up to 30 hours of battery life via 6 x AA batteries
No trailing wires to your console
Can be located either above or below your TV set
On/Off button with power light
Can be used with your existing Sensor Bar stand
Provides up to a 10 metres operating range
Operates from 6 x AA 1.5 volt batteries (not included)