Gear4 StreetParty Wireless Portable Speaker with Bluetooth, Black (PG748US) Wireless portable speaker Rechargeable lithium-ion battery Speaker phone Line-in port for use with other music players Up to 8 hours battery life (at maximum volume) Wireless portable speaker. Rechargeable lithium-ion battery. Speaker phone. Line-in port for use with other music players. Up to 8 hours of battery life at maximum volume.