Music player with lithium-ion battery. - Brand: ergoPouch - Product Name: Driftaway - Model: EPWN-TAUPE - Battery: Lithium-ion battery 800mAh - Charging Voltage: DC 5V 0.5A ergoPouch / Driftaway Portable White Noise Machine - Drift Away Portable White Noise Machine Price: ¥8,250 Equipped with 7 sounds and LED lights to improve sleep environment. A portable white noise machine. It was a godsend item that helped me sleep soundly! ^_^ The ergoPouch Driftaway Portable White Noise Machine provides a relaxing sleep environment for babies and families by masking other sounds and noises in the room with 7 sleep-inducing sounds. I have opened it for confirmation, but it has not been used. Thank you for looking.