We bought this safety monitor but didn't end up using it regularly because we had our little one in our room for 5 1/2 months, so i felt very safe with her right by my side.

It did give us peace of mind when we did use it, but we just forgot to put it on regularly!

It sells for $96 on amazon and I'm looking for $70+shipping (probably only a couple bucks as it's small!) I have the manual and the case as well. The batteries still work and it definitely alerts you if it doesn't detect movement! (Had a false alarm because I didn't attach it to the diaper correctly!)

http://www.amazon.com/Snuza-ILSHER-Baby-Monitor-Hero/dp/B008OJ7C6Y