Hollyland SYCOM 421S 4-Transmitter 1800' A/V Transmission System
SKU: 438671262

Hollyland SYCOM 421S 4-Transmitter 1800' A/V Transmission System

Sale price$4157.55 Regular price$4619.50
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Description

Hollyland SYCOM 421S 4-Transmitter 1800' A/V Transmission SystemThe Syscom 421S 4 Transmitter 1800' A V Transmission System with Carry Case from Hollyland is a multi cam wireless video transmission system that communicates with up to four cameras using a single receiver with PTZ control as well as tally. Supporting up to 1080p60 video signals via SDI and HDMI, the transmitter receiver system offers an 1800' line of sight transmission range with 0. 07 second latency. The 421S system also supports Ethernet pass

The Syscom 421S 4-Transmitter 1800' A/V Transmission System with Carry Case from Hollyland is a multi-cam wireless video transmission system that communicates with up to four cameras using a single receiver with PTZ control as well as tally. Supporting up to 1080p60 video signals via SDI and HDMI, the transmitter/receiver system offers an 1800' line-of-sight transmission range with 0.07 second latency. The 421S system also supports Ethernet pass-through, so you can stream directly via RTSP to the Internet.

The receiver features four SDI and four HDMI outputs (one for each transmitter) for connecting to a monitor or switcher. You can control PTZ cameras via IP or RS-422/485 serial connections. The transmitters have a dedicated tally output port that support optional tally lights. Both units also have an OLED display that confirms the resolution, transmission channel, signal strength, and other details such as battery power. Each transmitter has an L-series battery plate, and the receiver has a V-mount battery plate. Both Transmitters and receiver also feature a 2-pin power input for alternate DC power options.

Features
  • Up to 1080p60 transmitter/receiver system
  • 1800' line-of-sight transmission
  • SDI and HDMI input
  • SDI and HDMI output
  • Passes control and tally over LAN
  • OLED display

Specifications

Inputs / Outputs
Antenna I/O Transmitter/Receiver: 4 x RP-SMA Female
Video I/O Transmitter: 1 x HDMI Input
Transmitter: 1 x BNC Input
Receiver: 4 x HDMI Output
Receiver: 4 x BNC Output
HDCP Support Not Specified by Manufacturer
Embedded Audio SDI
HDMI
Audio I/O None
Power Transmitter/Receiver: 1 x (Unspecified Type) 2-Pin (36 VDC) Input
Other I/O Transmitter: 1 x USB-C Input
Receiver: 1 x USB-A Input
Transmitter/Receiver: 1 x RJ45 (LAN) Input/Output
Transmitter/Receiver: 1 x Proprietary (RS-422/RS-485) Input/Output
Wireless
Wireless Range 1800' / 548.64 m (Line-of-Sight)
Channel Bandwidth 40 MHz
Frequency Range US: 5.1 to 5.9 GHz
Latency < 0.07 sec
RF Power ≤ 22 dBm
RF Sensitivity -90 dBm
Wi-Fi Yes
Bluetooth None
Format Support
Video Format HDMI
1080p: 60/50/30/25/24
1080i: 60/50
720p: 60/50
576p: 50
480p: 60
SDI
1080p: 60/50/30/25/24
1080i: 60/50
720p: 60/50
576p: 50
480p: 60
Audio Format Not Specified by Manufacturer
Timecode Support Yes
Power
DC Input Power 36 VDC
Battery Type Transmitter: 1 x L-Series
Receiver: 1 x V-Mount
Power Consumption Transmitter: 12 W
Receiver: 32 W
Mounting
Mounting 1 x 1/4"-20 Female
1 x 3/8"-16 Female
Environmental
IP Rating None
Environmental Protection None
General
Material of Construction Metal
Dimensions Transmitter: 5.7 x 3.5 x 1.2" / 144 x 88 x 30 mm
Receiver: 9.5 x 5.8 x 2.4" / 242 x 148 x 62 mm
Weight Transmitter: 15.2 oz / 431.5 g, Including Antenna, Battery Plate
Receiver: 3.6 lb / 1621 g, Including Antenna, Battery Plate
Packaging Info
Package Weight 23.95 lb
Box Dimensions (LxWxH) 21.5 x 18.25 x 9.25"
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 438671262

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Lynn
Belleville, US
★★★★★ 5
Dog loved it
Size: One-Size-for-Most
Great! My dog loves taking it outside at night so he can see where it goes easier. Super bouncy, he has had it for over a year now and still not destroyed. Perfect size for his mouth too and easy to clean.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
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Verified Purchase
Leslie Guffey
Cuba, US
★★★★★ 5
Light up and glow in the dark ball
Size: One-Size-for-Most
Definitely my girls favorite ball 😀. It disappears and I have to buy another one or she goes nuts. Glows in the dark, brighter with more sun. The bounce light up don’t last a real long time, too quick to quit for her but still loves it.
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Reviewed in the United States on May 13, 2026
A
Verified Purchase
AirNelson
Los Angeles, US
★★★★★ 5
Durable & Bright - Great for Heavy Chewers
Size: One-Size-for-Most
Pros: Extremely Durable: Survived an aggressive chewer where tennis balls failed. Dual-Visibility: Features both internal flashing lights and a glow-in-the-dark "chargeable" surface. Perfect Size: Fits comfortably in the mouth of a 40lb medium-sized dog. Same size as a tennis ball. Cons: Battery Life: Unsure how long the internal flashing lights will last (though it has held up well so far).
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Reviewed in the United States on February 8, 2026
A
Verified Purchase
Andrea S.
Massapequa, US
★★★★★ 5
Great for night time play!
Size: One-Size-for-Most
This ball is great! It is a 2-for-one light up feature so we love the flashing lights and if she drops it in the snow after those lights stop, we can still find it because of the strong glow that gets its charge from the flashing LED lights. Our first one lasted a few years, we lost it on a trip so now back for our second one so we can keep the night time fetch going! She is a golden retriever for size reference. Any bigger of a breed and I would worry it might be too small for her mouth. It’s a bit smaller than a tennis ball. Just don’t make the same mistake I did and let them have it in the house at night, she walked up to my bedside while I was asleep one night and squeezed it to activate it. Those lights are so bright it was a rude awakening!
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Reviewed in the United States on November 11, 2025
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Verified Purchase
Katie
New York, US
★★★★★ 4
Good option for playing at night
Size: One-Size-for-Most
This ball is a good option if your dog likes to fetch at night. It stays lit for about 20 minutes or so, but that is me only leaving it out of the counter, being "charged" by whatever house lights are on. My dog isn't a big chewer, but it seems as though it would hold up well. I like that it is easy to rinse and clean. It seems to be a good value.
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Reviewed in the United States on January 16, 2026

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