Krypton Rechargeable Portable Speaker This speaker is great for parties and large gatherings or large rooms. With the wireless microphone (included) you can sing along to music or make announcements. In addition, this speaker also has the additional functions of a USB port, through which you can play your music by connecting a pen drive, a microphone slot for connecting various other multimedia devices, audio playback, a microphone and FM radio. The loudspeaker has an integrated 3.7 V 1800 mAh battery. Can be used for outdoor activities, and advertising campaigns. and leisure activities.