A communication device that may be removably coupled to a USB port, the device having a processor and non-volatile memory and configured to execute code, including code for receiving a wireless transmission including an alert signal from a second device, where the second device is a wireless doorbell, code for sounding an alarm via an audio or visual indicator on the communication device in response to the alert signal, code for receiving input from a user and transmitting a response signal to the second device, and code for allowing two-way audio communication between the communication device and the wireless doorbell.