1): LED display music function: MP3 music stereo output, can store 30 music. 2): Character Size: 1.5-or 2.1-or-4.8-7.2 or 9.6inch Characters. 3): Character Color: Mono/Multi-color/Rgb Characters.  4): Message Input: Remote Control or PC message entry.  5): Max. Viewing distance: 450 ft.  6): Message Capacity: 100 different messages can be stored and displayed.  7): Outline border: Aluminum alloy enclosure.  8): Power: 100-240V AC,12V or 24V DC.  9): Sign memory: 512k bytes. 10): Memory Retention: 10 years.  11): Message presentation modes: 26 Modes. 12): Online update firmware. 12): Real-Time Clock: Date and time, 12 or 24 hour format. 13): Operation Temperature: 32 to 158ºF, (0 to 70ºC)  14): Humidty Range: 0% to 95% non-condensing.  15): Power cord length: 1500mm.  16): Mounting: Hardware to accomodate ceiling or wall mounting .  17): Optional communication ways: RS232, RS485, USB,TCP/IP,Wireless,GSM, GPRS. 18): Provide secondary development SDK. Provides sample code, technical support.