Specially waterproof， dustproof， anti-shock designStylish triangular appearance model with good stabilityWireless Bluetooth functionA2DP stereo Bluetooth transmission2 x 1.5W strong output power with outstanding sound qualityWaterproof， Dust-proof， Anti-scratch， Shockproof， suitable for both indoor and outdoor exercise1500mAh high capacity built-in rechargeable battery， playtime lasts for 5 hours at least Specifications:Model: ER-151Bluetooth Version: V2.0+EDROperation Range: 10mMaterial: ABS + IronTotal Power: 15wImpedance: 4ΩSNR (Noise-Signal Ratio): ≥60dBFrequency Response: 60Hz-20KHzBuilt-in Battery Capacity: 1500mAhBattery Type: Li-polymer batteryTalk Time: 8HStandby Time: 120HAudio Interface: 3.5mm jackPower Supply: Built-in 1500mAh rechargeable Li-on battery or powered by mini USBSize: 150 x 56 x 56mm / 5.91x2.2x2.2inchWeight: 385g/13.58 ozColor: Black