Features: Wireless BT4.1 Technology: Enjoy wirelessly high-quality music from your smart phone or tablet via BT Connection. IPX7 Waterproof: IPX7 waterproof means no more worrying about rain or spills; you can even submerge JBL GO2 in water. 3.5mm Wired Connection: Compatible with almost all 3.5mm audio devices, such as MP3, DVD player, computer, TV and more. Rechargeable Battery: 730mAh rechargeable Li-ion Polymer battery supports up to 5 hours of music playing time. Hands-free with Mic: Built-in noise free speakerphone ensures crystal clear conference calls over the speaker. Specifications: Brand Name: JBL Model Number: JBL GO2 BT: V4.1 Support: A2DP V1.2, AVRCP V1.5, HFP V1.5, HSP V1.2 Interface: 3.5mm Port Loudspeaker: 1 * 40mm Output Power: 3.1W Frequency Response: 180Hz-20kHz Signal-to-noise ratio: ≥80dB Battery: Lithium-ion Polymer (3.7V, 730mAh) Battery Charge Time: 2.5 hours Music playing time: up to 5 hours (varies by volume level and audio content) Color: Black, Red, Yellow, Grey, Lake Blue, Dark Blue (Optional) Item Size: Approx. 8.6 * 7.1 * 3.1cm / 3.38 * 2.79 * 1.22in Item Weight: Approx. 184g / 6.49oz Package Weight: 270g / 9.52oz Package List: 1 * Speaker 1 * USB Charging Cable 1 * Quick Start Guide