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White rectangular transmitter and receiver units with HDMI and RJ45 ports, status LEDs, mounting brackets

STARTECH

STARTECH ST121HDBTPW HDMI over CAT5 HDBaseT Extender v extender

SKU CH-2BH6-BKYE0 MPN ST121HDBTPW

Extends HDMI up to 330 ft over CAT5 using a single power adapter for 4K video and 7.1 surround sound

  • Supported distance100m / 330 ft
  • Supported resolutions3840 × 2160 (4K) 2560 × 1600 1920 × 1200 1920 × 1080 (1080p)
  • Sound7.1 Surround Sound
  • Indicator light1 x Status (transmitter) 1 x Status (receiver)
  • Power supplyInput Current; 0.5 A Input Voltage: 100 to 240 AC Output Cur
  • Spec summaryAudio: Yes Ports: 1 Cabling: Cat 5e UTP or better Daisy-Chai

Model 330 ft. Distance

  • Extend HDMI up to 330 ft over CAT5 with a single power adapter
  • 4K Ultra HD resolution support at 3840x2160 for sharp video detail
  • 1 surround sound audio pass-through for immersive listening
  • Power over cable eliminates the need for a power outlet at the receiver
  • Includes mounting brackets and grounding wires for secure installation

HDMI over CAT5 Extender

The ST121HDBTPW transmits Ultra HD 4K signals up to 330 ft over a single CAT5e or better cable. It serves installers and integrators who need reliable long-distance video distribution without running multiple power lines to the display end.

Power Over Cable Design

Only the transmitter requires the included 12 V DC adapter, while the receiver draws power through the same Ethernet cable. This eliminates the need for a nearby outlet at the display location and reduces cabling to one Cat5e run plus the supplied 1 m patch lead.

4K Resolution Headroom

The extender handles 3840x2160 at 60 Hz and scales down through 2560x1600, 1920x1200 and 1080p without compression artefacts. At the full 100 m distance 4K remains stable; beyond that length or with lower-grade cable the link will drop to lower resolutions or lose sync entirely.

How it compares

Measured against everything we stock in A/V Extenders & USB Hubs, at today’s prices. Recalculated every night.

Price $301.99
Pricier than about 82% of the 239 comparable items (median $132.99).

Specifications

Product
Brand nameStarTech.com
Model nameST121HDBTPW
Performance
Supported distance100m / 330 ft
Display
Supported resolutions3840 × 2160 (4K)
2560 × 1600
1920 × 1200
1920 × 1080 (1080p)
1280 × 720 (720p)
Audio & video
Sound7.1 Surround Sound
Power
Power supplyInput Current; 0.5 A
Input Voltage: 100 to 240 AC
Output Current: 1.5 A
Output Voltage: 12 DC
Size & build
Product dimensions1 in × 2.6 in × 3.1 in
Product weight0.95 lb (0.43 kg)
Shipping weight1.16 kg
Package size292 × 193 × 74 mm
More details
Indicator light1 x Status (transmitter)
1 x Status (receiver)

Other versions of this model

1 more in the same range

Questions about this item

Will the single power adapter need replacing before the transmitter and receiver units?

The extender ships with one 12 V DC, 1.5 A power adapter that powers both units through the CAT5 cable, so only that adapter may need replacement over time.

At the full 100 m cable run, which resolution drops out first?

3840x2160 at 4K is supported up to the full 100 m distance, so no listed resolution is lost before the cable-length limit is reached.

Does the transmitter or receiver generate noticeable heat when running continuously?

Each unit draws only 0.5 A at 100–240 V AC input, indicating low power draw and minimal heat during all-day operation.

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