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Two small black boxes with detachable antennas, IR cables, power adapters and mounting brackets

STARTECH

STARTECH ST121WHDS2 Wireless HDMI Extender Kit 4K 60Hz 165ft

SKU CH-T989-6R35X MPN ST121WHDS2

Wirelessly extends 4K 60Hz HDMI up to 165ft without line of sight, includes local HDMI output, IR extension, mounting kit and plug-and-play setup

  • Extender & Repeater TypeVideo Extender Transmitter/Receiver
  • Package Content1 x Wireless Transmitter 1 x Wireless Receiver 1 x IR Blaste
  • Wireless 4K 60Hz video up to 165ft with no cables needed
  • Works through walls and cabinets without line-of-sight for flexible placement
  • Plug-and-play setup needs no IP config, software or drivers
  • Local HDMI output on transmitter for a second display
  • IR blaster and receiver included for remote control from the display side

Wireless 4K 60Hz HDMI Extender Kit

The STARTECH ST121WHDS2 kit wirelessly transmits 4K video at 60Hz from an HDMI source to a display up to 165 feet away. A 5GHz point-to-point link operates without line of sight, so the transmitter and receiver can sit in separate rooms or inside cabinets. The transmitter also provides a local HDMI output for a second screen. Up to four kits can operate simultaneously in the same area.

Range, bandwidth and interference limits

The extender supports HDMI 2.1 TMDS with 18Gbps bandwidth and HDCP 1.4/2.2 compliance for protected content. Audio Return Channel (ARC) and 2.1 channel audio pass through the link. Because the system uses a dedicated 5GHz connection, it avoids the congested 2.4GHz band, but thick walls or heavy RF noise can still reduce the practical range below the rated 50 metres.

Replaces long HDMI cables and IP-based extenders

This kit removes the need for costly in-wall HDMI runs or Ethernet-based AV extenders that require network configuration. The jump is worthwhile when cable routing is impractical, when a local confidence monitor is needed, or when IR control must reach a hidden source device. It is not suited for installations that demand uncompressed bandwidth beyond 18Gbps or distances exceeding 165 feet.

Highlights

  • Wireless 4K 60Hz video up to 165ft with no cables needed
  • Works through walls and cabinets without line-of-sight for flexible placement
  • Plug-and-play setup needs no IP config, software or drivers
  • Local HDMI output on transmitter for a second display
  • IR blaster and receiver included for remote control from the display side

Specifications

BrandStarTech
ModelST121WHDS2
Part NumberST121WHDS2
Extender & Repeater TypeVideo Extender Transmitter/Receiver
Package Content1 x Wireless Transmitter
1 x Wireless Receiver
1 x IR Blaster
1 x IR Receiver
4 x Wireless Antenna
2 x Universal Power Adapter (NA/EU/UK)
2 x Mounting Kit
1 x Set of Rubber Feet
1 x Quick-Start Guide
Shipping weight1.81 kg
Package size363 × 155 × 89 mm

Questions about this item

Should I choose the 165ft kit or a shorter-range model?

This kit reaches up to 165ft (50m) with no line-of-sight required, so it covers longer distances and through obstacles where shorter models would fail.

What does 4K 60Hz actually deliver on my display?

It transmits 4K resolution at 60Hz with 18Gbps bandwidth, HDCP 1.4/2.2, 2.1 channel audio and ARC support for full-quality video and sound.

How does the 5GHz point-to-point link limit interference?

The dedicated 5GHz connection avoids the congested 2.4GHz band, supports up to four kits in the same area and needs no IP configuration or drivers.

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