Ultrasonic power cannon construction : Amazon.de: Electronics & Photo
KEMO Blinker B185: Amazon.de: Spielzeug
Ultrasonic Proximity Sensor, B214, PCB with Transmitter and Receiver, 4 to 32: Other Products: Amazon.com: Industrial & Scientific
Kemo B181N Paralyser, 15,000 V, generates high voltage sparks, ideal for self-defence against wild animals, etc., self-soldering kit, current consumption 100 - 200 mA: Amazon.de