Firstly, do not pay any attention to reviews here which state that the handset falls off easily when the phone is wall-mounted. There is a small plastic "hook" on the base unit part of the phone which needs to be reversed for wall mounting, as stated in the instructions. Once this has been done the phone is 100% secure on the wall and in fact even when the unit is upside down. I do wish people would be a little more careful with their Amazon reviews - the reviews system is so important when we are trying to chose a product to buy.
This is an excellent basic phone - no batteries, no extraneous features you'll never use. There is a light on the handset which flashes when a call comes in, but, crucially for me, it does NOT continue to flash to show a missed call or message waiting etc. I use this phone in my bedroom and do not want an annoying continuous flashing light (which I would have to take action to stop) - so this handset is perfect. It also has a simple switch to turn off the ringer - again, exactly what you want in a bedroom. I'm very happy with it.