BEHRINGER 5 PMP550M 500-Watt 5-Channel Powered Mixer with Klark Teknik Multi-Fx Processor FBQ Feedback Detection System Black Ultra-compact 500-Watt powered mixer Revolutionary Class-D amplifier technology: enormous power, incredible sonic performance and super-light weight Ultra-high quality KLARK TEKNIK FX processor with 25 presets including reverb, chorus, flanger, delay, pitch shifter and various multi-effects Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies for easy feedback removal "Wireless-ready" for high-quality BEHRINGER digital wireless system (not included)