Shure Blx1288/CVL/630 Dual Channel Handheld and Lavalier Wireless System Combo with Mini Headset UHF Band 512 - 572 Mhz Frequency Up to 12 compatible systems per frequency band (region-dependent) XLR and 1/4" output connectors Up to 300 feet (100m) transmission radius (line of sight) One-touch QuickScan frequency selection quickly locates the best open frequency (in case of interference)