BlackBox two way radios are built for range and for durability. The BlackBox Plus UHF radio is also extremely compact. But don't let it's small size fool you. The Blackbox Plus comes packed with power and features. This UHF radio offers up to 4 watts of transmit power and support for 16 channels with 50 CTCSS and 104 CDCSS private line codes. But that's just for starters.