The “Silent Messenger II” is a mid-sized message board. This rugged portable changeable message sign is designed to provide communications to improve traffic flow and safety in highway work zones. The Silent Messenger II consists of a 92” w x 54” h sign panel with a 27 x 48 pixel full matrix LED display on a sturdy steel trailer, powered by a combination of solar panels and batteries. Choose from either a foldable or Lift and Rotate trailer. The sign includes a GPS receiver, cellular transceiver, and FREE lifetime cellular service. Use with SolarTech’s Command Center software for remote communications – messages can be changed and managed remotely from an office pc or a smartphone. No cellular charges!