Looking for a funny, easy science experiment? This human motion sensor circuit board can satisfy your needs, and great addition to a classroom lesson plan. When conducting this experiment, stimulate curiosity and intelligence. Features - - Material:Resin - Size: 4.00X4.00X0.70cm/1.57X1.57X0.28in - Induction Angle: 120° - Sensing distance: about 1-3 meters - Input/Output: -5V - Load current:<0.5A - Mounting hole diameter: 3mm/0.12in - Mounting hole spacing: /1.30in - Note: Delay 2-3 seconds to turn off the load - The child's creativity and imagination are greatly developed while playing with this Electrical Experiment. - DIY Electrical human motion sensor material, exercise hands-on ability, enhance the interest in scientific experiments. - These accessory for physical circuit experiment, which will not leak electricity. - This educational experiment emphasizes fun, exploration, and discovery, can be good gift choice to your kids. - By completing the circuit science experiment project with your child, let your child experience the science. Package list: 4 motion sensor circuit board 4