Smartphone ready workout proofr r the tdk life on record sb40s smartphone ready headphones for sport were designed to meet the rigors of intense workouts the flexible ear hook design was engineered to fit comfortably and securely over your ears thereby preventing irritation and slipping during runs cycling sessions or while lifting weights carrying an ipx4 rating the sb40s headphones are resistant to sweat and splashing waterr r the integrated smartphone remote give you the full contro