The power of these Bluetooth® earbuds is controlled by magnets. When separated the earbuds will power on and will power off when the magnetic earbuds are placed back together. The built-in music control and microphone will allow you to control music and answer or reject calls. Playback time is 3 hours at maximum volume. Earbuds take 1 hour to fully charge. The transparent case size: 6 x 5.8cm. ABS Plastic.