Speaker/Mic. module(s) shall be Alpha Communications® / Golmar™ Nexa GB2 Alum. series or approved equal. Speaker/Mic. module(s) shall be modular type and shall be used in conjunction with the proper Nexa series modular aluminum panel frame(s), and the EL632/GB2 Sound Module and Color Camera. Contractor shall provide the proper number of 0, 1, or 2 pushbuttons as needed. When equipped with pushbuttons, all Nexa GB2 Alum. Speaker/Mic. module(s) shall feature Metal Pushbuttons, Nameholders and back-lit LED illumination. Contractor shall observe all local and national electrical and building codes.