PIR2 Sensor price is available at sensotec website.
Sonoff Pir2 Motion Sensor Features:
Ultra-low power magnetic dedicated microprocessor
Supports wireless frequency of 433.92MHz
200m wireless transmit distance
Built-in antenna provided
Less than 1μA quiescent current
Support Battery: 12V 23A
Wireless frequency: 433.92MHz
Protocol: EV1527
