Product information：Technical ParametersBluetooth version: V5.0RF power: +4DBMBluetooth distance: 10 meters MAXFrequency response: 20-20KHzBattery specification: 1003035 (1050MA)Product size: 80x46x13mmElectrical performance description:Charging input voltage range: 5VBattery charging saturation voltage: 4.2VBattery charging saturation time: about 6~8 hours when fully charged, the red light is off, and the blue light is always onLow battery warning voltage 3.3V, red light flashes 3 times every 2 minutes to remindLow power shutdown voltage 3.0V, red light on, shutdownShutdown quiescent current 100nAWorking current 20~40mAFull battery life 30~38 hoursStandby time 180 daysPacking list:1.50cm USB-MICRO 1PCS2.50cm 3.5 audio cable 1PCS3. Neutral English manual 1PCS Packing listBluetooth receiver x1