Intercom doorphone for dual rooms with a communication distance of up to 200 meters, offering convenient connectivity. Operates over a 200m range with 2-line wired connection, ensuring strong signal and clear o 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 applications. Specifications: Battery: 1.5V (each unit requires 4 x AA batteries, not included) Bell Ring Volume: 70dB at 0.5 meter distance Connection: 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 Material: ABS Color: White Notes: For proper operation, connect the units using matching color-coded wires. For distances up to 50 meters, use RVV2*0.5mm cable; for distances up to 100 meters, use RVV2*1.0mm cable. This listing includes 2 units. 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 is +/- 1-3cm.