... button 1) can insert menu card or advertisement 2) four-key with the function of CALL,ORDER,BILL,CANCEL Speciality: Y-F4 ... design, white color, 2. Can insert menu card or advertisement ,with four-key buttons, press each button you will get the corresponding ... . Transmission distance:800m in open area 5. It can work with the receiver of Y-400A and Y-500/485 Technical ...