This remote E3D v5 3D printer head (0.4 mm nozzle, 1.75 mm filament) is...
"1 Wire" 10 CM Male - Female
30 cm 1p Male to Female Wire
This M3x12mm hexagon pillar nut fits perfectly with the M3 hexagon pillars.
This electret microphone module is a high-quality amplifier. It has a single/dual input of 20dB. This is useful in recording sounds, applicable to portable audio devices such as laptops, cell phones, and handheld computers.
TPA6120 High Fidelity Stereo Headphone Amplifier Module
This slim little board has a class D amplifier on board that can drive 2 channels of 4-8 ohm impedance speakers at 20W each.
This is a 2-channel 3 W miniature class D audio amplifier based on PAM8403 chip. This is a highly efficient filter-free amplifier board which is great for adding the audio capability to your projects