Sparkfun Spectrum Shield
MSGEQ7 graphic equalizer display filter
Arduino Shield
collaboration with Ben Moyes of Bliptronics
Headers required (not included)

DIYmall 5 Pack HC-SR501 Pir Motion IR Sensor Body Module Infrared for Arduino
Using Potentiometer 105, output timing is from 0.5S to 200S
Widely used in:Security Products,human body sensors toys,human body sensor lighting industrial automation and control, etc
NOTE: On this retrigger jumper is a solder jumper, and you need solder it by yourself
Pls note that there is no IR emitter in this module, the principle of PIR sensor is to detect the infrared radiation emitted by the human body, it only have a IR sensor (cell)
Package Included: 5 X HC-SR501 PIR Infared Sensor

HiLetgo 3pcs Mini SR602 Motion Sensor Detector Module Pyroelectric Infrared Sensory Switch High Sensitivity for Arduino PI
Pyroelectric human body infrared sensor module, model: SR-602
Sensing distance: up to 5 meters; recommended 0-3.5M.
Output: high level, H=3.3V, L=0V
Power supply DC: 3.3V-15V
Quiescent current: 20uA