Sena Expand MESH - Multi-Sport Mesh Intercom™ Communication Headset
Boom Microphone: length 85 mm. Headset Profile (HSP). Can extend up to 1.6 km (1 mile) between a minimum of 6 users. Advanced Audio Distribution Profile (A2DP). - Main Module: 164 mm x 120 mm x 142 mm (6.5 in x 4.7 in x 5.6 in).