Discover this interactive soldering kit that responds to your presence by flashing its red LEDs in a heartbeat sequence This kit includes a heart-shaped PCB that will be able to stand on its own once you have mounted it. You will need to solder 24 red LEDs, along with lots of other components. Once completed, the Heartbeat Gadget will be able to detect your presence or any kind of movement from a distance. How, you ask? It has an infrared light and an infrared receiver. As long as the infrared receiver "sees" the infrared light, the LEDs will NOT work. When the receiver cannot "see" the infrared light anymore, because something or someone has come in between, the LEDs will start flashing. Basic product information: •• Instruction manual Languages: Dutch, English, French, German, Spanish •• Primary colors: Red •• Additional colors: black •• Depth unit: 3.8 cm •• Height unit: 15.5 cm •• Width Unit: 15.8 cm •• Weight Unit: 85 G • Technical data: •• Specifications Kit & Modules: Power supply: 9V battery (not included) • Operational characteristics: •• Coding level: None •• Electronics skill level: None •• Mechanics skill level: None •• Soldering skill level: 3.