... development of a completely independent multi-2.4G digital wireless transceiver digital voice and video intercom, It using long-distance wireless data ... Using ARM7 core, super-computing power.4. With 12-bit digital audio signal Serial Input, DAC audio output port,the sampling ... . With a monitoring function, easy operation.15. Using OV7725 camera, with 2.4-inch TFT display, clear image and clear ...