Ownership
The two things that protect you are the serial number and the published specification. Every current Hypervolt and Theragun has a live spec page to check a listing against — but each leaves figures out, and those gaps are where a seller's claim can say anything.
No rate published
01 MODEL
Warranty transfers
CHECK
Serial
REQUIRED
Spec check
USE IT
The most useful thing you can do with a listing is compare it to the manufacturer's own specification. If a seller says a Hypervolt 3 does 3200 RPM, the Hyperice page says 1500–2500 and the listing is wrong. If a seller quotes an amplitude figure for any Theragun or Hypervolt, it is invented, because no model from either brand publishes one.
The Hypervolt 2 is the case to know. Hyperice publishes its price, speeds, runtime, weight and attachments — $229, three speeds, three hours, 1.8 pounds, five heads — and rates the motor at 60W, which it does for no other Hypervolt. What it does not publish is a percussion rate, where the Hypervolt 3 pages give 1500–2500 RPM. Any RPM figure in a Hypervolt 2 listing came from somewhere other than Hyperice.
Worth knowing
Generation naming is a genuine trap on the Theragun line. Prime and Prime Gen 6 are not interchangeable in a listing, and a seller may not know the difference themselves.