<b>Warranty problem：</b><br> 2 years warranty & 40 days money back.<br> We have a dedicated quality inspection team for LISN painless ear hook bluetooth earpiece.<br><br> <b>Voice prompt adjustment：</b><br> If you accidentally adjust to Chinese, you can short press the “+” and “-” buttons simultaneously after turning on the bluetooth headset.<br><br> <b>About ear tips:</b><br> Each bluetooth ear hook headset comes with two ear tips, one can be placed at home, one can be taken out, and the two ear tips are placed separately to reduce the chance of the ear tip being lost.<br><br> <b>Note: </b><br> When the volume is set to a large volume, someone next to you can hear the sound of your headset.</b><br><br> <b>Since it is a Not in-ear headphone, the noise reduction function is not as good as the in-ear headphone, but we have also made an effort:</b><br> With CVC6.0 + DSP double noise reduction, we try to reduce the disadvantages of the Not in-ear headphone.<br> But it is not recommended to use this cell phone bluetooth headphone to talk and listen to music in very noisy places.<br><br> <b>About audiobooks:</b><br> This painless ear hook bluetooth earpiece is great for listening to audiobooks before going to sleep.<br> At the same time, this headset is also suitable for talking or listening to music in a quiet place.<br><br> <b>Specification:</b><br> Sweatproof: IPX4<br> Built-in Microphone: Yes<br> Working Distance: ≤33 feet（10m ）<br> Music Playback/Talking Time: 8-10hrs<br> Standby Time: 200hrs<br> Charging Time: 2hrs<br> Weight: 0.37oz/10.5g<br><br> <b>What’s in the box:</b><br> 1 x Single Ear Bluetooth Headset<br> 1 x Detachable Ear Tip<br> 1 x USB Charging Cable<br> 1 x User Manual