-8% Teensy 4 Audio Shield (Rev D2) — audio expansion board for Teensy 4.0 / 4.1 $ 18.08 $ 19.65 (0.0)
-8% High‑Voltage Pulse Inverter Module — DC 9.2–30V input, 2kV–20kV output; igniter/arc generator for long‑run operation $ 16.28 $ 17.70 (0.0)