The product of the roots of the equation

$9 x^{2}-18|x|+5=0$

$9|x|^{2}-15|x|-3|x|+5=0\left(\because x^{2}=|x|^{2}\right)$

$3|x|(3|x|-5)-(3|x|-5)=0$

$|x|=\frac{1}{3}, \frac{5}{3}$

$x=\pm \frac{1}{3}, \pm \frac{5}{3}$

Product of roots $=\frac{25}{81}$