This series of modules have different characteristics as below table:

Features:

1. Operating voltage: 2.7V ~ 5.5V
2. Operating temperature: -10 ~ 60°C
3. Low power consumption:
   Operating mode (Moving objects to be detected) < 1.5mA
   Standby with detecting mode < 50μA (Operating voltage 3.3V)
4. Optional communication interfaces: I²C or I/O
5. Adjustable sensing sensitivity – Network Mode
6. Supports external optical sensors (e.g. photo transistors)
7. Integrated temperature sensor with temperature compensation
8. Quick stabilization: ready for stable operation within 12 seconds after power on

Resources

Link to Holtek product webpage : HT7M2126, PIR Detector Miniaturized Module
Application Note: AN0400E, HT7M21x6 Optical Sensor Suggested Type and Debugging Method (with example code)