The DUO Full-Face Stereo Headset for the Tandem Pro 2 (TP2KIT) intercom unit is voice activated. The full-face headset is to be installed into the helmet. Usually the earpieces (2) are mounted behind the ear padding in the helmet and the microphone is attached to the inside of the chin piece with velcro. This type of mounting is great for instructors, just put the helmet on and have the student hook into the TP2Kit and your ready to go.
If you prefer to have a headset that you can take in and out the student headset (TP2STUDENT) will work.
Headset including Microphone for Full Face Helmets
*Works with Duo Pro and Tandem Pro 2