Weather Proof Industrial Telephone Unit is fully line powered and do not require an internal battery or external power source. The Telephone Unit is designed for industrial locations and ideal for noisy areas due to its noise cancelling feature. The Telephone Unit is equipped with magnetic reed hook switch with no moving parts and a sealed non- tactile keypad to keep out dust, dirt and moisture. Weather Proof Industrial Telephone Unit is constructed of a high-impact, aluminium alloy enclosure with integrated canopy and one-meter handset cord.