Peterson BBS 1 BodyBeat Sync Metronome Smith Optics The DC1400 Underwater Digital Camera HandlePod The DC1400 Underwater Digital Camera and Sea Dragon Flash Pro Set with Single Tray from SeaLife bundles the DC1400 camera with the Sea Dragon Digital Underwater Flash The M11 also supports wireless two way Bluetooth 4 BBS 1 Body Beat Wireless Synchronization Features: Wirelessly synchronize an unlimited number of performers Any Body Beat Sync can be a Master device or synchronized to a group of units Join an existing group of Syncs even after formation Multiple groups can perform in the same area with no interference from one group to another Wide wireless range does not rely on line of sight Use one Body Beat Sync to control another patched to the PA FCC approved You can rehearse with it audibly or perform with it silently