Review on Andfive Wireless Earbuds, [2021 Upgrade] Bluetooth 5.1 Headphones with Earhooks, Wireless Sport Headphones for Running, Bluetooth Earphones Noise Cancelling Deep Bass, IP7 Waterproof Headset by Joyce Cain

I just bought this, the sound is excellent and very pleasant. However, the "MDF" multifunction button is very annoying and difficult to use. Do you want to turn down the volume? Touch the left side three times. Want to turn up the volume? Press the right button three times. But sometimes it only registers two clicks and then pauses the music. Sometimes not even three clicks are recognized. I've tried soft presses, hard presses, fast presses, and slow presses. Conflicting answers and I gave up. Return them immediately.