The Hellcat Pro was designed with larger amplifiers, and the Lithium Battery provides more voltage to make this unit significantly louder than the Hellcat. It comes standard with 200+ sounds (100 Premium Sounds plus FOXPRO's Free Sound Library) that cover a variety of species, distress sounds, and vocalizations and can store up to 1000 sounds. The TX-1000 features a full-color graphic LCD screen, which displays your sound list or sound categories. It also has auto-volume, wireless upload to the remote, a battery level indicator, timer or time clock, FOXCast, and FOXBang technology.