Baseus S15 ANC Wireless Bluetooth Earphone Active Noise Cancellation V4.2 Bluetooth Sport Earphones with Mic for Mobile Phone
== Note ==
ANC(Active Noise Cancellation technology) requires a good external condition.So you need to choose the right size ear cap that fits your ears.Because ANC needs high power consumption to operate,this product turns off ANC by default when it is turned on.Therefore you need to open its switch to operate it.
1，That Active Noise Cancellation does not mask the noise; it removes a significant portion of the noise energy from the environment.
2，How to properly test the noise reduction effect?
First select the earmuffs that match your ears and then experience the noise reduction without playing music. This is the most obvious.