ITEM NAME:1*HC-SR501 Human Infrared PIR Pyroelectric Motion Sensor Module C2N5 "We've do our best to make the photo more close to the real items..It is a HC--SR501 Sensor Module. It has a high value of 3.3 volts and a low of 0 (it is either on or off). The entire sensor with the board is 32mm by 24mm (standard pir motion sensor). Either one will work.
