Piezo earphones ore radio circuit, when receiving radio, use C2 to tune, and the antenna is connected to A2, which can improve the selectivity.

A Power Cord, line cord, or mains cable is an electrical cable that temporarily connects an appliance to the mains electricity supply via a wall socket or extension cord. The terms are generally used for cables using a power plug to connect to a single-phase alternating current power source at the local line voltage-(generally 100 to 240 volts, depending on the location). The terms power cable, mains lead, flex or kettle lead are also used. A lamp cord (also known as a zip cord) is a light-weight, ungrounded, single-insulated two-wire cord used for small loads such as a table or floor lamp.

Power Cord

Power Cord,Home Appliance Power Cord,Power Cable Cord

Dongguan YAC Electric Co,. LTD. , https://www.yacenter-cn.com