myfree Foldable Bluetooth Headphones, Easy to pair and easy to storage, Brings You An Amazing Music Life.

Wireless Bluetooth Headphones--Super Longer Battery Time: Bluetooth Headset up to 30 hours music time (with 60% Maximum decibels) / 33 hours talking time and 600 hours standby time with a quick charge of only 3.5 hours.
Bluetooth Headset--Advanced Compatibility: The wireless bluetooth headphones can easily and quickly connect to most Bluetooth enabled devices such as X / 8/ 8 Plus / 7 / 7 Plus / 6s / 6s Plus, Samsung Galaxy S9 8 / Note 8 / S6 / S7 Edge, Moto Z / HTC 10 / HTC Desire 10 / ASUS Zen phone 3 / Huawei P10 / 9 Honor8, iPad, iPod, Samsung Galaxy devices, Sony devices, Bluetooth enabled PSP, TV, tablet, computer and more.
Suppot Siri neckband bluetooth headphones: In music and standby mode, long press MFB for appr. 2s to launch the voice dial（ Siri mode）, then just speak the people name you want call. This function can only work when your phone supports.

Charging:

When the headset prompt "Battery low", please use the standard charger and USB cable to charge the bluetooth earphone.
Orange light is on under charging, White light on when fully charged. (Note: Before charging, it is best to turn off the headset for safety. And make sure the earphone is fully charged before first using.)

Using Method

→Single click the MFB --- answer / hang up the call, play / pause the music.
→Double click the MFB --- to redial last number.
→long press "+"/"-"---Next song / Previous song
→single click"+"/"-"--- Volume up / Volume down
→Long press MFB for appr. 2 seconds to reject the phone.

What's in the Box:

1 x V4.1 KKY-992X Retractable Bluetooth Headset
1 x Micro USB Charging Cable
2 x Ear Tips
1 x User Manual