Notes:
If the headset you received has only one earbud to use for the first time, then you can do as I said, delete the bluetooth name in the phone, take all the earbuds out of the charging box, and then pair it again
The earbuds of this product are protected by transparent tape at the charging place of the charging compartment, please tear off the transparent tape as soon as possible after receiving the product and pair
M21 can be used with one ear and two ears, not all earbuds on a single device.
Link to manual
http://www.315.org.cn/fw/asyt/index.asp?id=19630908373429553246
M21 TWS Wireless Bluetooth Headphones Couple Earbuds Touch Earphones Stereo Sports LED Display 9D Four Headset for Double People For xaiomi huawei iphone
Product Description
Product Name ： M21 Tws Earbuds
Material ： PC+ABS
Package ： Gift box
Working distance ： About 10m
Charging input voltage ： 5V
Charging case capacity ：2000mA
Charging Time ：1~2 hours
Standby time ： About 120H
Talking Time ： 3-4 hours (1 time full charged )
Music time ：3-4 hours (1 time full charged )
Founction ： Waterproof, Noise Cancelling, Microphone, Music play/pause, connect/hang phone, reject call, up and down song switching, binaural HD call.
Waterproof ：Waterproof for Life care ( Sweatproof,rainproof,splashproof .Can't use for diving,shower etc. )
Connection method ：single/double free to use
Package Included:
2 pairs * wireless earbuds (left and right)
1 * charging box
1 * Charging cable
1 * QR code （User Manual）
1 * Paper box
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