SG-8 Folding Music Bluetooth Earphone Features: 1. [4 in 1 Multifunctional Headphone] Stereo Bluetooth + 16G TF Card MP3 player + FM Radio + 3.5mm Wired Headset function. 2. [Wired and Wireless Connection] Bluetooth 4.0 + EDR technology ensures strong signal and fast transmission, easy to pair with almost all Bluetooth-enabled audio devices to enjoy wireless stereo music; with 3.5mm audio jack, it can connect to a variety of music players (Such as, MP3 MP4, etc) without Bluetooth function. 3. [Noise Cancellation] Noise Cancellation and high-sensitive microphone reduce ambient noise and grasp the detail of voice. You can get high quality hands-free phone conversation even on the street. 4. [Long Duration Time] Built-in rechargeable Lithium battery lasts up to 10 hours of Talking Time, 10 hours of Music Playing Time and 250 hours standby Time in Power Off state per charge cycle. 5. [Ergonomic design] Foldable and adjustable headband length, super soft earmuff, comfortable to wear and easy for storage. Specifications: Model Number: SG-8 Type: Over-ear Stereo Bluetooth Headphone with Mic Bluetooth version: 4.0 + EDR class 2 Support Profiles: HFP1.5, A2DP1.2, AVRCP1.0 Transmission Distance: up to 10m Frequency Range: 2.402GHz-2.480GHz Frequency Response: 20Hz-20KHz Impedance: 32 ohm Sensitivity: 95dB Rechargeable lithium battery: 250mAh Talking Time: abut 10 hours (depends on the volume) Music Playing Time: about 10 hours Standby Time: 250 hours (Power Off State) Charge Time: 2-2.5 hours Plug Type: 3.5mm Audio Port Color: Orange; Red; Green; Blue (Optional) Main Item Size (Folding): 17.5 * 12 * 8.2cm 6.9 * 4.7 * 3.2in Main Item Weight: 182g 6.41oz Package Size: 18 * 12 * 8.0cm 7.1 * 4.7 * 3.1in Package Weight: 249.9g 8.8oz Package List: 1 * Bluetooth Stereo Headset 1 * USB Cable 1 * User Manual