720P 7 inches 2.4GHz Digital Wireless Monitor (HDW-127S): Dual screen mode,automatic cycle switching mode, single screen mode available,users can have any combinations of channels in dual view display Built-in recorder (Max. 128GB Micro SD Card) Range: 300m (barrier-free) Auto pairing Support 4 channel single view trigger display and 1 channel split view trigger display BLC. Screen brightness goes down automatically 5 seconds later once the environment gets dark. Auto scanning, each channel can be individually set to scan on or off, scan time 5-45S adjustable