The kit contains a DG WL-10 wireless digital amplifier and 2 x WL key wireless helmet modules which are paired ready for use straight out of the box. 

• Wireless connection from the amplifier to the helmet 
• Kit Includes 1 x DG WL-10 Wireless Amplifier and 2 x WL Key wireless helmet modules
• Paired ready for use straight out of the box
• Suitable for Stilo Venti WRC or ST5 WL helmets

Find the full specs of the package in the links below:

DG WL-10 Wireless Amplifier

WL Key Wireless Module