I am very pleased with the wireless earphones and from the seller. I have used these earphones for many days and I have no problem with them. I've used them in a gym, running etc. These earphones stick inside your ears that feel comfortable and it never falls of of my ears. It will not stop working because it's ipx5 waterproof resistance and connectivity between the two earphones to my phone was amazing because of 5.0 Bluetooth. Doing my running it was very easy to pick up the call because of his touch control and it was successfully cancelled all background noise. when I put on the earphones it was so quiet that I could hear my heartbeat and a touch system on earphones can play, pause music, pick , and end call etc.