ObboMed SA-4270 12V Cooling Ventilated Breathable Air Flow Car Seat Fan Cushion, with Adjustable Lumbar Mesh Support, Special Fitting for Car, Automobile, Vehicle Long Drive Solution Adjustable mesh lumbar support (curve measurement: 4-8), provide better ventilation and gently conforms to lumbar curve to keep the spine in proper alignment. (Tutorial Video: http://amzn.to/2qS3tmY) Best cooling solution for intense summer driving; small air vents at the seat and 7 larger air vents at the seat end to absorb body heat quicker, reduce perspiration and prevent sweaty skin. Refined 12V car premium cigarette plug with 3 stage airflow HIGH-OFF-LOW speed control switch and LED power indicator to minimize loose connection in the long run. Optional fitting at back rest of either vertical or horizontal strap to firmly affix to the car seat; vertical fitting at rear side of the car seat while horizontal fitting one strap under the head rest and the second strap at lower end of backrest. Additional fitting for seat cushion under seat by fixing metal and plastic hooks. Fitting possible at driver seat and co-driver seat. Suitable for cars seat with side airbags Universal fits for most automobile driver and passenger seats; optional AC 110V-230V to DC 12V, 1A adapter for indoor use for maximum comfort and high productivity in summer. (not included, check link: https://www.amazon.com/dp/B00XBNL45I). Small air vents at the seat for thigh and legs cooling 7 larger air vents at the seat end for back cooling Locking mechanism to minimize loose connection between plug and socket. Built-in UL certificated 5Amp fuse. Control switch of 3 stage airflow, High-Low-Off, Level I= High Speed, Level II = Low Speed. LED power indicator. Versatile attach either in vertical or horizontal way. Vertical fitting at rear side of the car seat. Horizontal fitting one strap under the head rest and the second strap at lower end of backrest. Additional fitting for seat cushion under seat by fixing metal and plastic hooks. Unlike conventional elastic bands, it won&#039;t lose elasticity over time. Suitable for cars seat with side airbags. Fitting possible at driver seat and passengerseat. <span class="a-text-bold">Adjustable Mesh Lumbar Support</span>designed for extra driving comfort and provides better ventilation. Curve measurement from4&#034; to 8&#034;to keep lumbar in proper alignment.