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Product Features: Bluetooth Version: V4.0 Modulation method: GFSK, π / 4 DQPSK, 8 DPSK The power supply voltage: 3.3 - 4.2 V Support BT protocol:HFP v1.6 HSP V1.2,A2DP V1.6,AVRCP V1.4 DI V1.3 The ...