The new commercial-grade Wireless Doorbell Chime and Wireless Entry Alertby STI provide musical, wireless chimes, with no electrical wiring and no through-the-wall drilling.  The Wireless Doorbell Chime’s (STI-3350) wireless button mounts next to a door and the receiver is plugged into any indoor electrical outlet. This chime also can be used as a pager for a person who requires special care. The Wireless Entry Alert (STI-3360) chimes when a door is opened and greets visitors, customers or clients with the sound of music while alerting of their presence. Both units are designed with an operating range of up to 500 ft. between transmitter and receiver. One of 10 different sounds can be selected and each device is UL/cUL listed and FCC certified.