JBL Charge 4

Wirelessly connect up to 2 smartphones or tablets to the speaker and take turns enjoying powerful sound
Battery type: Lithium ion Polymer 27Wh (Equivalent to 3.6 volts, 7500 mAh), battery charge time: 4 hours (5V/2.3A). Music playtime up to 20 hours (varies by volume level and audio content)
Take charge 4 to the beach or the pool without worrying about spills or even submersion in water, Bluetooth version: 4.2
Amplify your listening experience to epic levels and rock the party perfectly by wirelessly connecting more than 100 JBL connect plus enabled speakers