Features and Benefits Wireless Bluetooth streaming Wirelessly stream high-quality sound from your smartphone or tablet. 5 hours of playtime Built-in, rechargeable Li-ion battery supports up to 5 hours of playtime. Waterproof design The waterproof housing makes GO 2 perfect for worry-free listening by the beach or poolside, or even in it. Speakerphone Enjoy crystal clear conference calls over your speaker with the noise free speakerphone. Audio cable input Don't worry if Bluetooth is not available, plug the audio cable into the speaker and enjoy your music all the same. Specification: Bluetooth version: V4.1 Battery: 3.7V/500mAh Working time:4-5 hours S/N:≥80db charging time:2 hours Frequency: 180Hz-20kHz Weight: 184g size:71.2x86x31.6mm Colors:Black,red,blue,light green What's in the box: 1 x JBL GO 2  Bluetooth speaker 1 x Micro USB cable 1 x User manual