... sit for a long time,they need lie down♥Using “D” model battery, convenient to buy.♥3 grades timing and 3 ... ways of power supply(1 .DC:use 4 pcs of D type batteries;2.AC:use the power adapter),energysaving and environmental ... use,convenient to carry. Product performance parametersPower supply6VDC or 4 "D" batteries (not including,can last 150 hours)Three music modesleep ...