The Passive Infrared (PIR) sensor detects motion from humans within 3 meters. If moves are detected within that range, the sensor will send an 'ON' signal to the following blocks in the chain.Features The magnetic design at the back of Neuron blocks makes you can simply place your gadget on the magnetic surface such as whiteboard The redesigned magnetic Pogo Pin-connectors effectively prevent blocks from being connected incorrectly Support two ways to update firmware: wired and wireless The modules are color-coded according to their functionality, to make it easy to distinguish between them and find the right block The sides of each block are covered by a silicone sleeve to make sure that there are no sharp corners exposed Winner of 4 international design awards Specification Detecting Range: 0~3m Detecting Angle: 120° Initialization Time: Up to 10s Anti-drop Ability: 1.5m Operating Temperature: -10?~55? Operating Humidity: ?95% Weight: 8.7g