Hollyland Mars 400S PRO II Wireless SDI HDMI Video Transmitter and Receiver, 0.07s Latency 450ft Range, 4APP Monitoring, 1080p 12Mbps 5G Transmission System for Live Streaming Videography Filmmaking

$ 599.00 $ 549.00

Add up to 1080p60 wireless video transmission to your gimbal, mirrorless, or DSLR camera rig using the lightweight Mars 400S PRO II SDI/HDMI Wireless Video Transmission System from Hollyland. The transmitter provides HDMI and SDI inputs, and the receiver offers SDI and HDMI outputs. It features an extremely low 70 ms latency and a high 12 Mb/s data rate with line-of-sight transmission up to 500' to the receiver and to the Hollyview Wi-Fi app. For a strong line-of-sight signal, the system includes two external antennas on the transmitter and two on the receiver, and one is included as a spare.

Greater Range, Lower Latency
The Mars 400S Pro II is a powerful video transmission system that offers a transmission range of up to 500' and achieves a low latency of just 70ms. The Mars 400S Pro II is equipped with SDI and HDMI interfaces, supports multi-receiver setups, and allows monitoring through the HollyView App.

Crisp Clarity with High Data Rate
The system supports a high 12 Mb/s data rate, enabling high-definition video transmission and delivering clear, refined image quality with rich details.

Ultra-Low Latency
The Mars 400S Pro II raises the bar with a very low latency of just 70ms. It outperforms Mars 400S Pro by reducing latency by 30% and providing a stable signal transmission range of up to 500'. This ensures high-definition image quality and an immersive low-latency experience. It is also compatible with Mars 400S Pro, allowing them to be paired and used together.

Equipped with both SDI and HDMI interfaces, the Mars 400S Pro II provides enhanced device compatibility and convenient connections to various types of equipment. Whether it's a DSLR or professional film camera, the Mars 400S Pro II can fulfill your connectivity requirements.

Smart Channel Scan
Upon startup, Mars 400S Pro II automatically selects the best frequency channels. Manual channel scanning can be conducted using the receiver or the HollyView App, providing a visual representation of signal interference levels at each frequency. The app allows you to install optional channel-scanning firmware, enabling you to easily find the strongest transmission signals.

Monitor on up to 4 Devices
The Mars 400S Pro II offers flexible solutions to meet monitoring needs, including team collaboration, multi-crew monitoring, and multi-member cooperation. Using the Hollyview app for iOS or Android, you can monitor your video transmission in real time via a Wi-Fi connection as well as live stream directly from the receiver via your computer using a USB-C adapter. The transmitter can simultaneously transmit to up to one receiver and two apps, or to a total of four apps without the receiver.

Flexible Fan Control
Each Mars 400S Pro II unit is equipped with a three-speed fan adjustment feature (Auto, Low Speed, Off). Its intelligent cooling design allows it to perform optimally in various usage scenarios by reducing device temperature and ensuring stable signal transmission.

Integrated Cold Shoe
Integrated with a shoe adapter featuring a 1/4"-20 screw simplifies the installation process. Simply connect the shoe adapter of the Mars 400S Pro II to a cold shoe slot on your camera or cage without the need for any cumbersome additional installation steps.

Box Contains

    Hollyland Mars 400S PRO II Wireless SDI HDMI Video Transmitter and Receiver, 0.07s Latency 450ft Range, 4APP Monitoring, 1080p 12Mbps 5G Transmission System for Live Streaming Videography Filmmaking
  • 1 x Mars 400S PRO II Transmitter
  • 1 x Hollyland Mars 400S PRO II SDI/HDMI Wireless Video Receiver
  • 2 x Antenna
  • 1 x DC Power Adapter

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Easy 30 Day Return Policy

If you are dissatisfied with your purchase for any reason, you may return it to Kellards within 30 days of the purchase date, subject to the conditions and exclusions below.

You may initiate a return or exchange by requesting an RMA at sales@kellards.com.

Securely affix your return label to the outside of the shipping package. Return shipping fees are the responsibility of the customer. We recommend you ship via insured ground service with a tracking number. We cannot be responsible for lost packages.

Return Address

Kellards Return
3237 Greenpoint Ave.
Long Island City NY 11101

Eligibility Conditions

Please read conditions below. If all conditions are not met, Kellards reserves the right to refuse the return or to charge a minimum 15% restocking fee. All returned items must be in new condition, in their original unaltered box (including an intact UPC code) and must include all packing material, blank warranty cards, manuals and accessories. Kellards can only refund the original purchase price. Shipping and handling fees are nonrefundable.

Nonreturnable Items

  • Electronic software downloads
  • Opened consumable items (e.g., film, tapes, paper, bulbs, CD, DVDs, ink cartridges, etc.)
  • Underwater equipment that has been submerged

Defective or Damaged Items

Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.


Please allow 3-5 business days for mail-in exchanges to be processed.

Refunds & Credits

Once we receive and inspect your item(s), we will credit your account. Please allow 5-7 days for a credit to appear on your account. In most cases, we will issue your refund in the same way you made the original purchase.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.