Energy-Saving Two-Way Door Intercom

Physical dimensions: 22.2 x 8.7 x 7.3 cm (8.7 x 3.4 x 2.9 inches). Housing material: white ABS plastic. Power: 4 x AA 1.5V batteries per unit (not included). Connection method: wired RVV2 cable — use 0.5 mm² for distances up to 50 m, 1.0 mm² for 50–100 m (cable not included). Zero operational current draw in standby mode. Ring tone output: 70 dB measured at 0.5 m. Package includes two functionally identical intercom units. Intended for permanent or semi-permanent two-point communication in residential, light commercial and industrial auxiliary environments — such as house-to-garage, office-to-warehouse or villa gate-to-living area links.