Features:Build-in microphone， support telephone call and musical listening.Super mini size and lightweight， diameter is about 22mm.Cosy earbud design， comfortable to wear.Bluetooth， wireless， 10m transmission distance， very convenient. Rechargeable， just need two hours to be charged， and enough to talk or listen music for 3 hours. Support connecting two devices simultaneously.Simple operation， one button with multifunctions. Supplied with earhook to make it hard to fall off.Specifications:Brand name: OvlengModel: MiniaBluetooth version: Bluetooth V3.0+EDRStyle: In-earCommunication: WirelessTransmission distance: 10m / 32.8ftWireless frequency: 2.4-2.48gHZType of built-in battery: Rechargeable Li-ion battery Charge time: 2 hours (3.7V)Standby time: up 12 hoursLasting talking time: up to 3 hoursEarphone diameter: 2.2cm / 0.9inEarphone weight: 4g / 0.1ozPackage size: 19.5 * 9 * 3.5cm / 7.7 * 3.5 * 1.4inPackage weight: 52g / 1.8ozPackage List:1 * Bluetooth earphone 1 * USB cable 1 * Ear hook 1 * User manual(English��?