Samson XPD1 Wireless Handheld Mic (USB Receiver Not Included) Samson Stage HXD1 Handheld Mic - (USB Receiver Not Included) - Samson 2 Year Warranty Compatibility: Samson Expedition Series Portable PAs (XP106, XP800, XP1000) Simultaneous Systems: 2 Working Range: 100' line of sight Working Frequency: 2.404-2.476GHZ