Check the listing for details. Bosch B430 Plugin Telephone Communicator New. Condition: New. Listed at 7.99 USD. The Bosch B430 Plugin Telephone Communicator is a new communication device designed for alarm systems. With the trusted Bosch brand backing it, this telephone communicator ensures reliable communication for your business or industrial facility. The product is ideal for facility maintenance and safety, providing a secure and efficient way to monitor and communicate within your surveillance and alarm equipment setup.