Haven't tried FM as I assume signal loss when submerged. Another cool thing is replacement earbuds are only $2 or 3 on ebay. I also LOVE using this chin strap cap because it snugly holds the ear pieces in place... http://www.amazon.com/Aqua-Sphere-Speed-Plus-Black/dp/B00IBDTQYO/ref=sr_1_6?ie=UTF8&qid=1459566128&sr=8-6&keywords=swim+cap+chin+strap