With basic functions such as call, speech, door opening, and floor call. It features an electronic call generator with a three-tone and alpha tone for door calls, as well as a continuous tone for floor calls. Performance features include a potential-free door opener and light button, an integrated audio privacy function for all applications (assignment as needed), and an electronic call signal that differentiates between door and floor calls, alpha and continuous tone. The volume control is infinitely adjustable, with a maximum of 83 dB(A). It includes a plug-in handset for easy installation and conversion for desk mounting with appropriate accessories. Technical specifications: Contact type: 2 NO contacts 24 V, 1 A; Dimensions (mm) W x H x D: 91 x 201 x 46.