We received our white and blue Graco baby monitor as a gift over 6 years ago.  It has lasted, without any problems, and continues to be durable and reliable. It has lasted through drops to the floor!

It is a very simple, two channel monitor with lights that react to sound in a room. It is battery operated as well as AC adapter operated (your preference). It is a very easy set up and readily movable to another room for your convenience.

The item was approximately $40 at Target. It was not the cheapest nor the most expensive.