9mm (Red) 4 Meter Polyolefin Heat Shrink Tube Sleeve MJE13005A Transistor The board's header pins receive

The board's header pins receive power input and relay control signals

When you speak on the phone or play music

As for the adjustment pattern

These are MOF with a value of 680 ohm 1W and tolerance of ±5%

9mm (Red) 4 Meter Polyolefin Heat Shrink Tube Sleeve MJE13005A Transistor The board's header pins receiveTypically used to bundle wires and to seal electrical junctions, as well as to protect wire junctions from corrosion and abrasion. This 9mm Heat Shrink Sleeve is ideal for insulation. It features remarkable insulation properties, great stress control properties, long term weather, and regular wear and tear resistance, ease of installation, and reliable performance in even the most extreme conditions. Specification Product Type Heat shrink tube Voltage