Ringtones are adjustable with the small button on the side. The volume is not adjustable but it is strong enough to hear the bells throughout the house. The receiver is not bulky (10 x 5.5 cm). Installation is easy, the button can be bonded with the supplied double-sided, or screwed through the spaces provided. Doubt remains about the tightness of the button (not attached). A check in the rain. Operating very brief instructions supplied in the package.