Description : 2pcs Home\/ Office Wired Intercom Telephone System with Wall Mount 200 meter maximum cable length between the device. Works standalone， does not require controller such as PBX or working telephone lines. Easily set up intercoms in offices and homes. Requires a 0.65mm dual wire cable between handsets (not included). Specifications : Dimensions : 3.54 x 2.56 x 0.98 inch Weight : 27.06 oz (767 g) Package included : 1 x 2pcs Wired Intercom Telephone Details pictures :