attention :<br /> * battery is not included<br /><br /> * the special and pleasant sound of the doorbell has several bel cantos for all people to choose.<br /> * delicate streamlined appearance shows the special tastes of the host.<br /> * up-dated intelligent flash light design brings convenience to the hearing handicapped.<br /><br /> * no wiring or drilling， wireless transmission to master the item.<br /> * ultra-distance represents the technology of surpassing obstacles.<br /> * simple vivid installation design， save money when installation and don't effect the decorate environment.<br /> * energy saving design of environment protection， the battery inside the button can last for one year(20 presses per ).<br /><br /> * suitable for: dwelling house， work building， hotel， factory， hospital or any other places.<br />it not only brings you convenience， but also give you the unexpected happiness and freedom.<br /><br />package included :<br />  1 x wireless doorbell receiver<br />  2 x wireless remote control