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Used together with a call receiver, the call button (signal transmitter) APE830-SM has been developed to send instant messaging and to improve communication processes.
The call transmitter APE830-SM is wireless and works via radio frequency. It has an integrated external antenna, which enables a greater range, and can also be fixed with an adhesive pad or with screws.
When used in "single mode", the buttons work independently of each other, as it were as a 3in1 call transmitter (3 single buttons).