Just been out for a ride today (see my route to Blades Cafe Northleach) and seen the new SENA SMH10 Motorcycle Bluetooth Stereo Headset that a guy had, thought they were really expensive until he told me what he'd paid on a deal. Got home and, after forgetting what he'd said, found that www.sportsrider.co.uk have a promotion on at £149 for the single and £289 for the dual pack - Cheapest apparently in the UK, worth a look and I'm certainly up for a couple at that price".
Or are you using the radio independently of the Senna?