1.Custom designed PCB shape as per mechanical CAD Drawing. 2.Micro-USB charging port for Li-ion battery 600mA to 1000A with charging indicator 3.Audio playback in loop. Duration of each track.... seconds. With small speaker. 4.RGB SMD LEDs 1206 package or other 6x to 10x quantity quantity on back side of PCB for illumination. 5.Optional: Changing color of LEDs or fading effect. 6.Slide power switch for main power cont Show More