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. Transparent case size: 6 x 5.8cm. ABS Plastic.