I haven't been able to check if they work - I've registered them on my tires and my car doesn't have a tire sensor - but they still don't work, not sure if it needs batteries but i can't check it now anyway because my tires are mounted and it will cost me $160 to take them off and another $160 to put them back on - too expensive - but I do I don't know if they work but they don't work at the moment - so yeah I feel like I wasted my money on a product I thought would work - they should have more description after the electronic product - but yeah , I would go back but I can't afford it