1)Infrared sauna room , Sauna 2)"CE","ROHS" ,"ETL" "ISO9001" 3)OEM service 4) Carbon heater& ... selected models is difference . 20GP/ 20days , 40GP/40HQ/ 25-30days 2) Shipping cost : we need know your destination port ,then we ... parts : send 3% ----5% spare parts as replacement 5) Guarantee : 2 years for electrical parts , 1year for CD/ Radio etc , 10years ...