Listen in from anywhere
When dialing to the MSP-4, a sound informant will inform you about the status of the security and sensors. The remote microphone will help you understand the causes of concern. Output to the speaker to create dispatching elevators for industrial facilities. The built-in balance check function will inform about the end of funds on the MSP-4 account.
The external antenna lets you place the MSP-4 in a convenient location.