How to easily install exit signs for JREEL1RC ？

*Aluminum housing with high grade acrylic panel:Single clear printing.
*Compatible with drywall or drop ceiling mount installations.
*Bar hangers included.
*Single face,6" clear acrylic panel,with silver or white Mylar.
*Removable directional indicators.
*120V~277VAC dual voltage operation
*Super bright red LED lamps.
*Buit-in 3.6V 500mAh Ni-MH battery for minimum 90 minutes emergency operation.
*Maximum 24 hours for full recharge time
*Test switch and charge indicator
*Removable front cover for easy installation and battery maintenance.
*UL and cUL(Canada) listed
*0℃ to 40℃ indoor damp location listed