The Replay XD1080 or Replay XD720 RePower Battery Adapter is perfect for supplying external battery power to your camera for endurance events and activities, You can use the RePower 2200 3+ hours or RePower 4400 6+ hours Battery Pack to charge or give your camera that extra juice, The adapter also includes a 3, 5 mm mini jack to plug in an external audio source, With a 32GB microSDHC card and the RePower Battery Adapter you can capture extended video and time-lapse photos, Shorty 80 mm, No External Audio In, Only Internal Audio 3, 1 in:, Great for mounting on helmets with a very short connection or the ability to quick charge your Replay XD1080 or Replay XD720, SKU: RLYX039