The Sena SMH5 dual pack bluetooth communication system installed on LS2 and MT helmets. Sena SMH5 Bluetooth Headset & Intercom for Scooters and Motorcycles with Universal Microphone Kit. The SMH5 series provides two-way intercom functionality that keeps you connected to your riding companion for conversations and music sharing through the crystal-clear Bluetooth® stereo headset. GENERAL • Talk time: 7 hours • Stand-by time: 7 days • Operating temperature: -10˚C – 55˚C (14°F – 131°F) Dimensions: