S15-R221A is a SMD dual digital infrared sensor from Jingchuangheli Technology. It has small SMD reflow solder mounting type, digital signal processing, enabled power regulation, built-in filter, adjustable sensitivity and timing, light-controlled output, low voltage, low power consumption, etc. It is suitable for infrared moving detection, Internet of Things, wearable devices, smart home appliances, home, smart lighting, security, automobile anti-theft products, network monitoring systems and other fields.