2 years. Before that we bought NRF45. The block worked fine. NRF30 works well too. But there seems to be a problem with all of these units. The 12 volt plug is not as tight as it should be. It doesn't take long to turn it off. For both devices I had to buy a high quality plug and replace the original plug. The original plugs are not of poor quality, but they are not tight enough. It was very annoying.
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