.i have parallax PIR sensor but what other type can i use that is more accurate tthan this?
What do you mean with "more accurate".
This one doesn't have the adjustments found on the more commonly used HC-SR501.
The "field of view" of a PIR is largely set by the shape/segments of the Fresnel lense (the dome).
Some PIR sensors for alarm system come in different Fresnel lense varieties.
Leo..