Find your serial number Each Bose product has a unique serial number or 4digit code located on the product or original packaging Most serial numbers can be found on the back or bottom of the product, and typically near a barcode Most serial numbers are 17digits long (or 4digits long for some headphones) and can include letters and numbers I have somehow managed to set the language on my bluetooth noice cancelling headphones Bluedio T7 to Chinese, so I asked the seller on Ali Express Here is the response dear customer, you can press the multifunction button and volume '' to change the language It worked!By email at aftersales@***com;
Bluedio Av0 Dp Noise Free Bluetooth Stereo Headset
