SINGCALL Home Caring System,Hotel Calling System,Big Touching Button,Make Calling More Convenient,360 Degree Water-proof,Touchable Button,One-button Pager APE520 (It Can't Be Used Alone!!) 3.39*3.39in flexible square with big round button of 2in diameter, letting simple enlarge fashion. The super big attractive button with 2in diameter, and the sensitive touching reaction , making the calling more convenient. 360 degree water-proof handling and the simple pushing bottom base without screws showing the humanized design and making it simple to change batteries. Simple and stable login mode, the phenomenon of messy code does not appear. Signal is stable and long distance.