500k Ohm (504) Trimpot Trimmer Potentiometer 3386 Package 8 Ohm 0.5 Watt Speaker 49.8mm Diameter\ This 3x4x2mm SMD Tactile Switch

This 3x4x2mm SMD Tactile Switch is widely used as a standard input Button on PCBs

8V UART header

Withstand 300VAC surge input for 5 second

which means it may be linked to three distinct electrical circuits

It's an 8-Bit CMOS Microcontroller with nano-Watt Technology

500k Ohm (504) Trimpot Trimmer Potentiometer 3386 Package 8 Ohm 0.5 Watt Speaker 49.8mm Diameter\ This 3x4x2mm SMD Tactile SwitchA general purpose board mountable preset is also known as potentiometers, trimpots, and other names, but it is essentially simply a variable resistor. Trimmer Trimpots is a high accuracy variable resistor with three terminal pins that can be mounted on a PCB. As the trimpot is rotated, the voltage between the terminals changes. It is used to change different parameters in an electronic circuit, such as voltage, current, and so on. The outer two pins