MH-M38 Bluetooth Module

MICRO power supply: YesAudio headphone jack: NoBuilt-in amplifier: Yes (5W + 5W)Lithium battery powered: YesSupport USB sound card, free drive: YesMusic memory/adjustment: NoMUTE interface: NoButton extension: NoBluetooth version: V4.2Support Bluetooth protocol: HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2, AVDTPV1.2Support audio format: Support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo two-channel outputOperating voltage: 5V / 3.7V-4.2VStand-by current: 5.5MAWorking current: 20MATransmission distance: 20 meters (empty or disturbing environment)Working temperature: -40˚C ~ +80˚CSensitivity: -87dbm