HC-SR501 Human Sensor Module Pyroelectric Infrared - PIR 

• Color: White + Green
• Dimension: 3.2cm x 2.4cm x 1.8cm (approx)
• Infrared sensor with control circuit board
• The sensitivity and holding time can be adjusted
• Working Voltage Range: DC 4.5V- 20V
• Current drain:<60uA
• Voltage Output: High/Low level signal:3.3V TTL output
• Detection distance: 3--7M(can be adjusted)
• Detection range: <140°
• Delay time: 5-200S(can be adjusted, default 5s +-3%)
• Blockade time: 2.5 S (default)
• Trigger: L: Non-repeatable trigger H: Repeat Trigger (default)
• Work temperature:-20-+80°C
• Trigger Method: L unrepeatable trigger / H repeatable trigger

*** infor can be found here