Visoule Premium Sport Wireless Running Workout Noise Isolation Bluetooth 4.0 in Ear Headphones Earbuds With Mic S/M/L size earbuds for a perfect fit to stay in-ear for each individual Bluetooth 4.0 and NFC function for wireless connections to any bluetooth device. Noise Isolation design to clear yourself from any distraction Built in mic control for taking calls, play/pause/skip functions 5 hours worth of music and talk time, 200 hour standby, 2 hour charging time