its been hard to adjust to them, but i can feel them working. she gives more than what you ask for. what program are you running that’s giving you difficulty? our neighbors bedroom window is on the other side of the of the fence so it would be ideal to find something that offered him, and us, privacy. two-point source interference occurs when waves from one source meet up with waves from another source. you do need to be careful about storing it as it can stink up a small space in a matter of minutes. place lid on top and shake like crazy. 