From the manufacturer
Mpow Bluetooth 4.1 Receiver with Quick Charging — Mpow Smarts Your Life
1. Quick Charging Technology & Long Battery Life:
Mpow Bluetooth receiver features a quick-turnaround that gives you 2 hours of playback from a 5-minute charge.
45 Minutes to fully charging for 15 Hours music enjoyment or 120 Hours standby time.
Please note: Use the 5V adapter to charge the Bluetooth adapter.
2. User-Friendly Switch:
Designed with humanized ON/OFF button and widened volume/track control on the side for quick and convenient control.
3. Sleep Mode for Power Saving:
1) Mpow 129 receiver will enter into sleep mode if there is no operation or disconnection for 10 minutes to save energy.
2) For activating your sleeping Mpow, just press the multi function button to wake it up and then enter into pairing mode.
If you want to turn Mpow off,please kindly turn the switch to off.