Denon HEOS 1 Wireless Speaker with GO Pack (Discontinued by Manufacturer) The HEOS 1 provides big sound from a compact, portable speaker The HEOS 1 has built-in Wi-Fi wireless audio streaming The HEOS 1 has a custom mid-woofer and dome tweeter and high efficiency dual channel digital power amplification The GO Pack has a lithium-ion rechargeable battery that provides up to 6 hours of playback on a single charge via Bluetooth, Wi-Fi or Aux In A Bluetooth USB adapter is included with the GO Pack for wireless audio streaming away from the network