Controlled Colored LED Studio/Busy/Available Sign (Case: 30x30 cm) It is designed for interior use. You can switch between busy/available messages using the remote control. It works with RF. It is sent with a lamp apparatus that indicates the position of the external sign via a lamp hung inside the room. It is hung with a hanging device. If you have a special design, we can help. We have options. Our products are our own production and are guaranteed against manufacturing defects for 2 years.