There’s no companion app to change how the buttons work or to change the EQ, and no Bluetooth Multipoint, but they have good defense from water, fantastic battery life (nine several hours/46 several hours total), and their case supports wireless charging — a uncommon function even about the priciest models. https://allhealthmarket.com/product/smart-wearables/smart-electronics-smart-wearables/headphones/b19-wireless-headphones-with-fm-radio-bluetooth-headset-stereo-microphone-2/