The portable bluetooth speaker can offer you endless enjoyment when you are travelling on the road. It is water， dust and crash resistant， so it is your best choice for rock climbing， surfing and cycling. With built-in microphone， you can conveniently pick up a call by this mini speaker in car， bathroom， anywhere when it is connected to your cellphone.  Features:  Support A2DP and a bulit-in 5W speaker.  3D stereo sound， perfect sound quality.  Built-in microphone and hands-free function for clear voice call.   Water， dust and crash resistant.  Zinc alloy design， extraordinary texture.  Portable hook design， convenient to carry.  Specifications:  Bluetooth version: V4.0+EDR  Working distance: 10 meters (depending on the environment and the configuration of cellphone)  TF card: MP3， WMA， WAV， MGP， FLAC， APE format etc.  Water resistant level: 7 levels  Dust resistant level: 6 levels  Sensitivity: 80db  Battery type: Lithium battery 1400mAh 3.7V (included)  Output power: 5W  USB cable: USB 2.0， compatible with USB 1.1  Charging voltage: DC 5V  Charging time: 2.5 hours  Frequency response: 60Hz — 18KHz  SNR: ≥ 96db  Working time: 6 — 8 hours (depending on the volume and type of music)  Material: Zinc alloy  Color: Blue， camouflage (Optional)  Item weight: 252g / 8.90oz  Item size: 9.7 * 8.5 * 4.0cm / 3.81 * 3.34 * 1.57in (L * W * H)  Package weight: 337g / 11.90oz  Package size: 12 * 8.5 * 8cm / 4.72 * 3.34 * 3.15in (L * W * H)  Package List:  1 * Bluetooth speaker  1 * USB cable  1 * Snap hook  1 * User manual (English)