Delta II / MOD 536 & ARGONAUT II / MOD 535 The 536 has 100 watt pa, the 535 has only 5 watts Basic specs same for both Both will do 60m ( 1.8mhz to 29.999.99 mhz TX range) RX 100khz to 29.99.99 mhz Nice radios to have if they change 40 mtrs around. 73 Brad WA4MAE