Intercom doorphone for dual rooms with a communication distance of up to 200 meters, offering convenient connectivity. Operation range: 200m, 2-line wired connection ensures strong signal and clear audio transmission. Easy to install; supports DIY setup and can be placed on a desktop or wall-mounted. Energy efficient design with no power consumption when idle. Practical and versatile, suitable for use in offices, warehouses, homes, and other locations. Specifications: Battery: 1.5V (each unit requires 4 x AA batteries, not included) Working Current: Not specified Bell Ring Volume: 70dB at 0.5 meter distance Connection Type: Wired using RVV2 cable (cable not included) Dimensions: 22.2 x 8.7 x 7.3cm / 8.7 x 3.4 x 2.9 inches Notes: For proper operation, connect units using matching color-coded wiring. For distances up to 50 meters, use RVV2x0.5mm cable; for distances up to 100 meters, use RVV2x1.0mm cable. This listing includes 2 units. Color: White Material: ABS Package Contents: 2 x Wired Intercom Doorbell Note: Light reflection and differences in display screens may cause slight variations between the product color in images and actual color. Measurement tolerance: +/- 1-3cm.