WirthCo LED Message Board is designed to light up your message with sparkled neon effect. It's easy to write, erase, and rewrite you message over and over. Just write your message with the white fluorescent marker pen (included) and erase your message or drawing with the cloth (included). You can use the controller button to select color and flash effect with adjustable speed. This message board is durable, portable and energy efficient; it only requires 110 Volt of power. The dimensions are 15-3/4 inches by 11-3/4 inches and it features horizontal or vertical hanging tabs. For over 30 years, WirthCo has been a prime manufacturer of practical products for making life easier and safer. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.