This is PCB (printed circuit board) - A PCB is usually a multi-layered board made of fiberglass. The surface and sublayers use tiny copper lines to direct electricity to various components on the PCB. Motherboards, SIMMs and credit-card memory are all examples of PCBs. The PCB in the Smart Watch houses the CPU, memory and radio chip. With PCB, we can store many thinh in this watch. We not afraid when we need something to use to save or store the important things because Smart Watch can help. Furthemore, when we bored or want know what happen in environment, we can use radio from Smart Watch