Two modes of Mesh: Open Mesh Intercom allows you to communicate with a near-unlimited number of users while Group Mesh Intercom enables a private group with up to 24 participants Comes equipped with Sena's HD Speakers Mesh Intercom range can be extended up to 8 km (5 miles) with a minimum of 6 people connected Bluetooth Intercom has a working distance of up to 2.0 km (1.2 miles) in open terrain Pair the 30K to your smartphone via Bluetooth and you can take/make phone calls, listen to music, and hear GPS navigation Advanced Noise Control, Advanced Audio Distribution Profile (A2DP)