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 BT speaker allows you to take it anywhere, like climbing,hiking,driving and more. Specifications: Brand Name: AEC Model: BT209 Color: Black, Silver (Optional) BT Version: 4.2 BT Profiles: A2DP, AVRCP, HFP, HSP BT Communication Range: About 10m, (without obstacles) Wireless Output: Class2: +4dBm (-6 ~ +4dBm) Wireless Band: ISM Band: 2.402-2.480GHz Password: 0000 Battery: Battery Type: Lithium Polymer Battery Capacity: 3.7v 450mAh, 1.67w Battery Life: Cycle Charge 500 Times Working Time: About 4 hours Calls & Music (middle volume) Charge Time: About 2 Hours Horn-speaker: Speaker Size: 32mm * 1 Speaker Impedance: 4ohm Output: 5W * 1 Frequency Response: 200Hz ~ 20,000Hz Sensitivity: 95dBm Distortion: less than 5% Speaker: Microphone Sensitivity: -45db Standby Current: less than 1mA Consumption: 42mAless than Iless than 500mA;0.15 Wless than Pless than 1.85 W Charge Port: Micro USB, DC5V Product Size: 91 * 47 * 20mm / 3.58 * 1.85 * 0.79in Product Weight: 81g / 2.86oz Material: Aluminum, ABS, PU leather, Metal Cover Package Size: 11.4 * 11.4 * 3.5cm / 4.49 * 4.49 * 1.38in Package Weight: 143.2g / 5.05oz Package List: 1 * Speaker 1 * USB Cable 1 * Sling 1 * User Manual (English / Chinese)