Bose S1 Pro Plus Speakerbuilt-In 3-Channel Mixer With Tonematch & Reverbtake Full Control Of Your Sound With An Integrated 3-Channel Mixer. Each Channel Features Dedicated Eq And Reverb Settings, Along With Bose's Proprietary Tonematch Technology-Designed To Enhance Vocals And Instruments With Studio-Quality Clarity. wireless Freedom With Bluetooth & Optional Transmittersstream Music Wirelessly Via Bluetooth Or Go Completely Cable-Free With Optional Wireless Transmitters For Microphones And Instruments (Sold Separately). Transmitters Conveniently Store And Charge Inside The Speaker, Making Setup Fast And Hassle-Free. versatile Multi-Position Design With Auto Eqwherever You Play, The S1 Pro Plus Adapts. Use It On The Floor, Tilted Back, On A Stand, Or As A Monitor Wedge-Built-In Sensors Automatically Adjust Eq Settings To Deliver Optimal Sound In Any Position. | Bose S1 Pro+ Portable Rechargeable Bluetooth PA System - Black, & Wireless Speakers | S1PROPLUS | P.C. Richard & Son