Our Pulsating Massage Pillow can be operated by batteries, or using this adapter. With this AC/DC adapter you will be able to plug your massage pillow into any standard wall outlet to power it via electricity. Save on the cost of batteries, or leave it plugged in where you use the pillow most. Simply connect to your massage pillow, and then plug into the wall to operate. 3v output. Massage Pillow sold separtately.