Key features

• •Built-in lumbar support made of high density stamped foam, increased seat comfort and relieve back pain from long periods of sitting. (For all the same function with NO lumbar support feature, please check Obbomed SH-4150 https://www.amazon.com/dp/B00X76BZGM)
• •CAUTIONS: Ensure to insert the plug into the bottom of socket and turn around the socket to ensure the tight fit between plug and socket. The key is the "contact" between plug and socket. When the "contact" become loose caused by the unavoidable bumping car along the road, the electrical resistance will become high and generate high heat between the "contacts" and become possible malfunctions. As such, the driver has to check the "contact" is always firm and tight from time to time.
• •Refined 12V car premium cigarette plug with UL 5Amp fuse to minimize loose connection between plug and socket in the long run, 3 stage control switch and LED power indicator. Warm & comfortable in winter to avoid sleepiness and dizziness by car heater. Two Heating levels: Level I = pleasant constant warmth (26W), Level II = fast heating (45W).
• •Special fitting of either vertical or horizontal strap to firmly affix to the car seat. For car use, vertical fitting is suggested for the safe release of air bag. (Tutorial Video: http://amzn.to/2qRKKrt)
• •Optional AC 110V-230V to DC 12V, 4A adapter for home use (not included, check ObboMed PD-1204AUS 12V 4A AC/DC Power Adapter with Cigarette Lighter Connector: http://www.amazon.com/dp/B00XBO35C2)