Garmin LIDAR-Lite Optical Distance LED Sensor [V4] : ID 4441 : $59.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Garmin vívofit 4 activity tracker with 1+ year battery life and color display. Small/Medium, Black. 010-01847-00, 0.61 inches : Sports & Outdoors