Purchased in July 2022 from the official Amazon store. Used until March 2025. Selling because I purchased a different model. No history of malfunctions. SDI & HDMI Wireless Video Transmission System, Outdoor Use Possible, DFS Certified, 1080P 60Hz, 0.08s Minimum Latency, 120m Transmission Range, 5G Wireless Transmission Technology Hollyland MARS 400S PRO also supports 5-12V / 2A. Additional Type-C charging for L-series batteries, 6-16VDC power supply for MARS 400S. 【Receiver for Live Streaming】Make sure the video format is displayed on both the transmitter and receiver, connect to a computer using the Type-C LAN connector, and use the RX to directly use the video feed for live streaming. 【Channel Scan & App Upgrade & High Resolution】MARS 400S PRO supports channel scanning and firmware updates via the APP. Channel scanning can be used on both the receiver and the HollyView app, but the app enables easy and quick firmware updates. FHD monitoring quality has been improved from 8Mbps to 12Mbps for the 400S! 【SDI & HDMI & OLED Screen】MARS 400S PRO supports both SDI and HDMI, including SDI IN on the transmitter and HDMI OUT on the receiver. The MARS 400S PRO also comes with an OLED display screen that displays the device number, WiFi signal strength, scene mode, USB indicator, device ID, channel display, video format, fan, and battery status. 【APP Monitoring】The Hollyland MARS 400S PRO transmitter supports two receivers. Regarding the number of RX and apps, follow these patterns: 2 RX - 0 apps, 1 RX - 2 apps, 0 RX - 4 apps). [Lollipop Antenna] Frequency Range: 5000~5900MHz, Specifications: 2 pieces Input Impedance: 50Ω, Voltage Standing Wave Ratio: 2. Gain: 2.5dBi, Polarization Form: Circular. Polarization Form: Circular Maximum Output: 50W, Temperature: -30°C to 60°C, Height: 63mm, Weight: 19.4g