*designed for 4-5 persons *voltage:110v 0r 220v * Removable high quality infrared *heater system infrared heaters(or *carbon fiber heat panel) *Dome light with brightness adjustable *comfortable backrest and bench seating *CD player with Radio(stereophonic) * Digital temperature and time control panel inside and outside * Temper glass window(s) on doors *floor and ceiling vent for air circulation *Low operating cost