Single Channel. 1 camera can be paired with more monitors; Support 1T1R、1T2R、1T3R and maximum 1T4R; Support TF card recording, maximum 128G; BLC. Screen brightness goes down automatically 5 seconds later once the environment gets dark; Brightness, contrast, color is adjustable by Monitor RX1. Other functions can be set separately by RX2、RX3 and RX4