Safe and Secured from Unwanted Guests

We want our family to be safe and secured always but we’re not at their side at all times especially when they’re at home and you’re out to do some errands. I’ve always admired my neighbor who painstakingly studied the pros and cons of having home security cameras in their house and come up with a gadget which no one can suspect that it can record all incoming and outgoing guests. He can also view people outside their house specifically at the post of their gate. I would also like to have a gadget like that to protect my home from unwanted guests. Actually I saw a wireless wall clock surveillance system and got interested in it because no one can possibly guess that it’s a recorder and surveillance gadget thus it will serve its purpose.