RTI KX4 Touch Screen Controller amp Two standard AA batteries provide

Two standard AA batteries provide up to 7 hours of continuous use

Size : Small

but it also has a USB computer connection

the frequency response stays constant

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RTI KX4 Touch Screen Controller amp Two standard AA batteries provideRTI's NEW KX4 Touch Screen Controllers. Ideal for single room commercial applications such as meeting rooms, classrooms, and lecture halls, the KX4 combines an in wall touch panel and hard button input with a built in control processor. The result is an enhanced automation solution that combines control simplicity with power in a single cost effective unit. Specifications: KX4 boasts a 4 high resolution capacitive touch display with five configurable