The Sena 30K Dual Motorcycle Bluetooth Communication System with one click of a button can connect to a virtually limitless number of 30K users within a mile range via the Mesh-network technology.Bluetooth intercom: up to 13 hoursMesh intercom: up to 8 hoursOperating temperature: -10°C - 55°C (14°F - 131°F)Main module: 102 mm x 56 mm x 27 mm (4.0 in x 2.2 in x 1.1 in)Speaker Driver Unit: 40 mm thickness 6.5 mmBoom microphone: length 190 mmWire between Speakers: length 555 mmWeight: main module - 61 g (2.15 oz)Noise Cancellation: Advanced Noise Control Codec: Built-in SBC CodecMesh Intercom TechnologyCharging time: 1.5 hoursCharging temperature: 0 C 45 C (32°F 113°F)Fast Charge: 20 minutes of charging equals 5 hours Bluetooth intercom or 3 hours Mesh IntercomType: Lithium Polymer BatteryWorking Distance:Bluetooth Intercom: up to 2.0 km (1.2 miles) in open terrainMesh Intercom: up to 2 km (1.2 miles)* in open terrainBluetooth Intercom: 4 ridersOpen Mesh Intercom: virtually limitle