Substitution Sign 23 cm Font (One Sided)

Substitution Sign Features
23cm Font Height,
38cm X 74cm Aluminum Case,
Long-lasting Lithium-Ion Battery,
6 Hours charging time, 140 minutes Usage Time,
Button Controlled number changing and memory feature
Non-glare Grinded Smoked Plexiglass front and back surface
High Quality wide angle dip LED