Baby monitor- One bracelet stays on baby; the other on parent. The units work in tandem with the base station to transmit basic biometric data about baby’s condition like temperature. The units also transmit sounds and even remotely play music for baby.
The most famous door organizer - it was mentioned on Oprah - is the Doorganizer from Israeli company Monkey Business. It's widely available, at places ranging from The Container Store to Target to Amazon.com.