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.