HOLLYLAND MARS 300 PRO ENHANCED Used only once. Almost new. Key Features: One-wheel button on the side for main unit operation Equipped with an organic EL display on the side Line-of-sight transmission distance to receiver: 120m Line-of-sight transmission distance to app: 90m Transmission delay: 0.1 seconds Transmitter has HDMI input and HDMI loop-out ports Receiver has two HDMI output ports One transmitter can transmit to one receiver and two apps (or up to three apps if no receiver is used) Automatic channel selection Thank you for viewing.