Other baby trackers use capacitive sensors or microphones, but this one senses motion by triangulating points of light. A Wiimote camera reports the position of the light points, and a microcontroller computes the relative change in motion to indicate breathing. Initially Gjoci planned to use LEDs, but the lights weren't bright enough and he worried the baby might "gulp the components." He settled on lasers instead, using 1-MW laser diodes to project four points of light. Newborns don't move much, so there's not much danger of the tot moving into the lasers' path, but he is still searching for a safer alternative.