Check the listing for details. Kurzweil KST-300A Portable Rechargeable Combo Amplifier W/four-channel mixer-. Condition: Open box. Listed at 459.00 USD. The KST300A Portable Rechargeable Combo Amplifier from Kurzweil features a four-channel mixer with two microphones and two instrument inputs with volume, bass, and treble controls. It has a built-in rechargeable battery and wireless receiver. This amplifier can be used as an all-in-one PA system designed to provide audio entertainment for party-goers, DJs, and announcers at indoor and outdoor events like parties, camping, and presentations.The KST300A is equipped with a built-in music player that reproduces songs from USB, media card, or auxiliary input ports. Featuring three speakers—two matched 6.5" LF drivers, and one 3" HF driver—, the dual-channel 24W (12W + 12W) Class-D power amplifier delivers a natural sound for many applications. The rear-panel bass-reflex port offers an extended bass response. In addition, the KST300A includes a wireless handheld mic and a bodypack with a lavalier mic. A telescoping handle and wheels make for easy transport to and from venues.Three SpeakersDual-channel 24W (12W+12W) Class-D power amplifier featuring two matched 6.5" LF drivers and one 3" HF driver.Four-Channel MixerTwo instruments and two mic inputs with volume, bass, and treble controls.Wireless Receiver with Handheld and Lavalier Microphones Featuring a built-in wireless VHF receiver, the KST300A comes with both a handheld and a clip-on lavalier microphone.Built-In Rechargeable BatteryWhen the amp is turned on, the power LED turns blue indicating that the battery needs to be recharged. Connect the power cable with an adapter and plug it into the 15 VDC jack. The power indicator light will illuminate red indicating the amplifier battery is charging. You can operate the amp while the unit is recharging.Built-In EffectsIndividual reverb, delay, and activator (harmonic enhancement) control.Built-In Music PlayerPlay and sing along with prerecorded material by way of the built-in USB and media card ports. Prefer to use your own player? Plug it into the KST300A's Aux input instead.Telescoping Handle and Wheels for TransportSporting a retractable luggage-style pull-handle and wheels, the KST300A is the perfect performance travel companion.Key FeaturesBuilt-In 4-Channel Mixer2 x Mic and 2 x Instrument InputsInput Volume, Bass, and Treble Controls2 x Wireless Mics: Handheld and LavalierIn the BoxKurzweil KST300A Portable Rechargeable Combo Amplifier.Wireless Handheld Microphone.Wireless Lavalier Microphone.Wireless Microphone Belt-Pack Transmitter.