Porodo Headphones supports Bluetooth version 5.0. Its frequency range is 20-2KHz and the Bluetooth protocol is HFP, SPP, AVBCI, and AZDP. It takes 2 hours for this headphone to be full charge.
When it is going to be full of charge you can use it for 21hours or in another hand you can find 21Hours playtime or if you’re in the hurry you can charge it for 15 minutes and use it for 1Hour. The pure Bass wireless Headphone is comfortable over-ear pad with an adjustable head Mount.

Bluetooth Pairing Method:
Press/hold the power key for 2 seconds until red and blue LED flash by turns, entering the pairing mode.
Turn on the BT device searching mode.
Choose the headset model, name: Soundtec-HP.
Blue LED flash(every 5 seconds) when pairing is successful.
The BT device would show the Bluetooth icon and battery capacity Of the headset, The icon is different based on your BT device mobile.

Long Playtime:
You are not supposed to charge this Headphone over and over. actually by one time charging you can use it for up to 21 hours. You can listen to your favorite music as much as you want. Also, you can use it for calling and talking to your Contacts as well.

Charging Function:
Connect headset USB to adapter or computer USB to charge. The red LED light is on when charging, and the light is off when fully charging. Automatic power off and can’t power on when charging.There is a voice prompt when running out of battery.