attractive price, okay look, missing instructions (how to set ringtones? you have to guess, fortunately the default ringtone is enough) and a defective 2 chimes quickly without effective solution (to change a module that is one of 2 chimes is not available, return all or nothing, which is annoying qd installed the doorbell button and make it work for half what is already useful) ... AND THAT PERSON TO EXPOSE THIS LITTLE PROBLEM!