IS Icstation Red Blue LED Flashing Strobe Lights Assemble Kits DIY Electronics Soldering Practice Set Blue and red lighting LED dipslay, simulate the LED warning light, Equipped with NE555 pulse generator and CD4017 counter Adjustable flashing frequency through RP1, creating diffrenent flashing lightings effects Unique stamp holes PCB design, support the the two color LED board splitting and power supply separately Working Voltage: DC 9V-12V Ship it out by USPS with tracking information and 7-17 days delievery time usually