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Product description Bluetooth Version:JL4.1. Frenquency:2.402-2.480GHz. MAX Power output:6W MIC Sensitivity: -32db . Receive Sensitivity: Better than +82dBm. Range: 10meters Data Transmission: Up to 3Mbps UART Data Transmission Rate:115200bps . Charing Voltage : 4.8V–5.2V DC Working Voltage: 3.7V –4.2V DC. Working Current: 100-200MA. Quiescent Current:>1UA. Battery :2000MAH. FM Frenquency: 87.0-108MHZ Built-in radio antenna Package included: 1X Bluetooth Speaker 1X Bicycle mount 1X Audio Cable 1X USB charge cable 1X Climbing Buckle 1X User Manual