AK-2000 : only one output jack (1) Six major functions of slow thumping, continuous thumping, acupunture, naprapathy, cupping and massages simulating the actual person . (2) Unique design of "Frequency control " key to make its therapeutic functoin penetrate into skin. (3) Under the single prescription, the unit will tured off automatically in 15 minutes. Power: DC 4. 5V, 3AAA (7#)batteries Frequncy: 1-330Hz Weight: About 82g Outline dimension : L132*W56*T23 mm components : one main uint , one wire , one wiring board, two pads , three batteries, one storage bag.