OnePlus Bullets Wireless Z Series Reverb Red - Bass Edition at best price. Your Bullets Wireless Z series headphones are ready before you are. A single 10 minute charge gives you 10 hours of music and movies. A full charge provides up to 20 / 17 hours of battery life, so you can keep the music going. With a 9.2mm dynamic driver and super bass tone fitted in each earbud, you get to experience rich sound and superior tonality every time you press play.