Product Features:• 1. Bent ear hook， allowing a more comfortable wearing headphones and higher quality calls • 2 three-ear earplugs choice， so you feel more comfortable • 3. Noise cancellation， allowing more perfect sound quality • 4.LED indication • 5 volume plus or minus keys • 6 Power / Mute button Product parameters:• Bluetooth specification: V2.1 EDR • Transmission frequency: 2.4GHz • Speaker power: 1mW (Max 3mW) • Operating voltage: 3.6V-4.2V • Transmission distance: 4M • Charging time: Max.3H • Voice calls: 7 • Lithium Battery: 5V， 250mah • Product Dimension: 14 * 19 * 3cm • Weight: 113g • Color: Black Package:• 1 * Bluetooth headset • 1 * USB cable • 3 * earplugs