This massage gun has 6 levels of intensity adjustment and a silent design! - Volume: <50dB - Battery capacity: 7.4V 1800mAh - Working time: 4-6 hours I have multiple units, so I will discount the shipping cost if you purchase multiple items. Loosen up your body and improve the quality of your performance (^ ^) If you don't mind if I take it out of the box, it will be ¥100 off. Thank you.