Depends on both the microwave and the bluetooth device in question. My favorite pair of headphones are rather inexpensive and my microwave is a couple decades o

Depends on both the microwave and the bluetooth device in question. My favorite pair of headphones are rather inexpensive and my microwave is a couple decades old and very high-wattage, and I get interference if I stand within a couple feet of it. I haven't had any other microwave or any other bluetooth device experience noticeable interference.