Technical Specifications

Mac, Windows, and Linux Logos


Mac Compatibility

  • Mac (M1/M2 series) with PCIe cards that have compatible drivers
  • Mac (Intel®) with Thunderbolt 3 ports
  • Mac (Intel) with a Thunderbolt 2 or Thunderbolt 1 port with an Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter plus a Thunderbolt 2 cable (both sold separately)
  • macOS® 10.12.6+
  • macOS Ventura compatible

Windows Compatibility

  • Windows computer with Thunderbolt 4 or Thunderbolt 3(1) ports
  • Windows 11 and 10

Linux Compatibility

  • Linux computer with Thunderbolt 4 or Thunderbolt 3 ports
  • Linux Kernel 5.0+

PCIe Card Compatibility

For a list of compatible PCIe cards, see the following PDF

PCIe Cards Compatibility PDF Download Link


Part Number



  • 2-year

Form Factor

  • Thunderbolt desktop enclosure

External Connectors

  • Two Thunderbolt ports(2)
  • 12V power port

Expansion Slot

  • One x8 PCIe 3.0 slot
    x8 mechanical; x4 electrical (Thunderbolt 3 spec)

PCIe Cards Supported

  • One low-profile PCIe card

Power Adapter

  • Universal 60W, 100-240V AC, 50-60 Hz
  • NRTL Certified
NRTL Certified PDF Download Link

Operating Temperature

  • 0ºC to 35ºC (32ºF to 95ºF)

Dimensions (WxDxH)

  • 4 x 8.25 x 2.8 in. (10.3 x 21 x 7.28 cm)


  • 1.85 lbs (.84 kg)


  • RoHS 3 (Directive 2015/863)
  • IEC62368-1 and IEC62368-2 Safety

Package Contents

  • Echo Express SEL Desktop System
  • Universal power adapter
  • Region-specific power cable for US, Australia, Europe, Japan, Switzerland, or UK
  • Thunderbolt cable(3)
  • ThunderLok 3 Thunderbolt connector retainer clip(4)
  • Documentation

Support Links

Support Knowledge Base

Documentation and FAQs

Product Manual

PDF Icon

Technical Notes

  • While the Echo Express SEL features a 40Gbps Thunderbolt interface, some Windows computers equipped with Thunderbolt 3 use an x2 PCIe lane implementation of Thunderbolt 3 technology that limits PCIe performance to 20Gbps.
  • Second Thunderbolt port supports USB 3.2 Gen 1 (5Gb) or Gen 2 (10Gb) devices when connected with proper cable or adapter (sold separately).
  • Full performance requires the use of the included or comparable 40Gbps Thunderbolt cables; look for the Thunderbolt icon AND the number 3 on the connector housings to identify these cables. Full performance supported by any Thunderbolt 4 cable.
  • ThunderLok 3 compatible specifically with Sonnet 0.5- and 0.7-meter Thunderbolt cables.


Thunderbolt Cable (0.7-meter)

Thunderbolt Cable (0.7-meter)

Part No. TCB-TB3-07M

  • 0.7-meter Thunderbolt cable
  • Delivers full 40Gbps bandwidth
  • Supports 100W of Power Delivery (PD)
  • Compatible with Sonnet ThunderLok 3
ThunderLok 3

ThunderLok 3

Part No. TB3-LOK2

Secures Sonnet 0.5- or 0.7-meter Thunderbolt cables with ThunderLok 3-compatible products.

Not compatible with Sonnet 1- or 2-meter Thunderbolt 3 cables, or with Thunderbolt 4 cables.
Power Adapter

Power Adapter

Part No. PWR-5A-12VA

Spare power adapter (12V, 5A).

Echo Express SEL