NECK MASSAGE PILLOW WITH BUILT-IN SPEAKER & MP3FEATURES:THE MASSAGING MUSIC PILLOW IS STYLISH, COMPACT, PORTABLE AND EASY TO USE. MASSAGE YOUR NECK, UPPER BACK, LOWER BACK, WAIST, LEGSVIBRATION FREQUENCY AND MOVEMENT FREQUENCY OF HUMAN MUSCLE TO MATCH QUICKLY RELIEVE NECK, SHOULDER, BACK, LEGS, WAIST AND OTHER PARTS OF THE PAIN.NEED TO PUT BATTERY AA SIZE 2PCSSPECIFICATIONS:UNIT TYPE: PIECEPACKAGE WEIGHT: 2.000 KG (4.41 LB.)PACKAGE SIZE: 31 CM X 31 CM X 12CM (12.20 IN X 12.20 IN X 4.72 IN)PACKAGE INCLUDES:1 X MASSAGE PILLOW