Profile: Brook-Tel Mfg. & Supply Co., Inc. manufactures telephone components. We offer a full line of handset assemblies and handset parts. Our products include handsets, cradles & hangers, receiver units, transmitter units, handset cords and plugs. We offer two basic versions of G-4 type handsets, namely push-to-talk and push-to-mute. The push-to-talk handsets allow the user to initiate transmissions by pressing the bar switch. The push-to-mute handsets allow the user to stop transmissions by pressing the bar switch.