Unique acoustic design produces natural sound quality that allows you to reach crisp voice up to approximately 13 meters (63 m) • Uses a dedicated rechargeable battery that can be used repeatedly without removing it. • Energy saving design that can be used continuously for up to 13 hours (using 4 AA NiMH batteries); ● Splash proof performance equivalent to IPX2 safety even when used outdoors. *JIS/IEC protection grade.Splash-proof specification; Can be used while playing music on external devices such as portable players; Equipped with a whistle function that is convenient for sporting guidance and disaster preparedness; Comes with 3 different ways to choose from belt-shaped, body bag or shoulder bag.