Features:[Advanced BT Technology]Wireless BT 4.2 technology ensures transmitting strong signal in high quality and offering high-fidelity stereo music.[High-quality Sound Effect]BT 209 with high-quality speaker and vibrating diaphragm, delivers clean and great sound quality, the sound will fully fill the room.[Hands-free Call]Hands-free calling function setts your hands and ears free.With built-in HD microphone, it performs outstanding sound quality when answering calls.[Endurance Time]With build-in high capacity rechargeable 450mAh batttery, it provides 4 hours of working time.Powered by the included Micro USB port.[Portable Design]Portable, Light-weight, Pocket-sized, this Bluetooth speaker allows you to take it anywhere, like climbing,hiking,driving and more.Specifications:Brand Name: AECModel: BT209Color: Black, Silver (Optional)BT Version: 4.2BT Profiles: A2DP, AVRCP, HFP, HSPBT Communication Range: About 10m, (without obstacles)Wireless Output: Class2: +4dBm (-6 +4dBm)Wireless Band: ISM Band: 2.402-2.480GHzPassword: 0000Battery:Battery Type: Lithium Polymer BatteryCapacity: 3.7v 450mAh, 1.67wBattery Life: Cycle Charge 500 TimesWorking Time: About 4 hours Calls & Music (middle volume)Charge Time: About 2 HoursHorn-speaker:Speaker Size: 32mm × 1Speaker Impedance: 4ohmOutput: 5W × 1Frequency Response: 200Hz 20,000HzSensitivity: 95dBmDistortion: 5%Speaker:Microphone Sensitivity: -45dbStandby Current: 1mAConsumption: 42mAI500mA;0.15 WP1.85 WCharge Port: Micro USB, DC5VProduct Size: 91 * 47 * 20mm / 3.58 * 1.85 * 0.79inProduct Weight: 81g / 2.86ozMaterial: Aluminum, ABS, PU leather, Metal CoverPackage Size: 11.4 * 11.4 * 3.5cm / 4.49 * 4.49 * 1.38in Package Weight: 143.2g / 5.05ozPackage List:1 * Speaker1 * USB Cable1 * Sling1 * User Manual (English / Chinese)