SAR TEST REPORT

Product Name: USB TYPE-C WIRELESS HDMI DISPLAY TRANSMITTER & RECEIVER

Model Name: DA-TCHR

FCC ID: 2AOSA-DA-TCHR

Issued For: Sabrent

709 Science Dr, Moorpark, CA 93021 United States

Issued By: Shenzhen LGT Test Service Co., Ltd.

Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China

Report Number: LGT25F173HA03

Sample Received Date: Jun. 17, 2025

Date of Test: Jun. 20, 2025

Date of Issue: Jun. 27, 2025

Max. SAR (1g): Body: 0.811 W/kg

The test report is effective only with both signature and specialized stamp. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report only apply to the tested sample.

Revision History

TEST REPORT CERTIFICATION

Applicant: Sabrent

Address: 709 Science Dr, Moorpark, CA 93021 United States

Manufacture: Sabrent

Address: 709 Science Dr, Moorpark, CA 93021 United States

Product Name: USB TYPE-C WIRELESS HDMI DISPLAY TRANSMITTER & RECEIVER

Trademark: Sabrent

Model Name: DA-TCHR

Sample number: LGT2506130

APPLICABLE STANDARDS

Prepared by: Deng Deng, Engineer

Approved by: Vita Li, Manager

1. General Information

Environmental evaluation measurements of specific absorption rate (SAR) distributions in emulated human head and body tissues exposed to radio frequency (RF) radiation from wireless portable devices for compliance with the rules and regulations of the U.S. Federal Communications Commission (FCC).

1.1 EUT Description

1.2 Test Environment

Ambient conditions in the SAR laboratory:

1.3 Test Factory

2. Test Standards and Limits

(A). Limits for Occupational/Controlled Exposure (W/kg)

(B). Limits for General Population/Uncontrolled Exposure (W/kg)

NOTE: Whole-Body SAR is averaged over the entire body, partial-body SAR is averaged over any 1 gram of tissue defined as a tissue volume in the shape of a cube. SAR for hands, wrists, feet and ankles is averaged over any 10 grams of tissue defined as a tissue volume in the shape of a cube.

Population/Uncontrolled Environments: Are defined as locations where there is the exposure of individuals who have no knowledge or control of their exposure.

Occupational/Controlled Environments: Are defined as locations where there is exposure that may be incurred by people who are aware of the potential for exposure, (i.e. as a result of employment or occupation).

NOTE

GENERAL POPULATION/UNCONTROLLED EXPOSURE

PARTIAL BODY LIMIT 1.6 W/kg

3. SAR Measurement System

3.1 Definition of Specific Absorption Rate (SAR)

SAR is related to the rate at which energy is absorbed per unit mass in an object exposed to a radio field. The SAR distribution in a biological body is complicated and is usually carried out by experimental techniques or numerical modeling. The standard recommends limits for two tiers of groups, occupational/controlled and general population/uncontrolled, based on a person's awareness and ability to exercise control over his or her exposure. In general, occupational/controlled exposure limits are higher than the limits for general population/uncontrolled.

The SAR definition is the time derivative (rate) of the incremental energy (dW) absorbed by (dissipated in) an incremental mass (dm) contained in a volume element (dv) of a given density (p). The equation description is as below:

SAR = dW/dt / dm = dW/dt / (ρ dv)

SAR is expressed in units of Watts per kilogram (W/kg) SAR measurement can be related to the electrical field in the tissue by

SAR = (σ E^2) / ρ

Where: σ is the conductivity of the tissue; p is the mass density of the tissue and E is the RMS electrical field strength.

3.2 SAR System

MVG SAR System Diagram:

A diagram shows the components of the MVG SAR system including a Robot, Probe, Phantom, Liquid, EUT Holder, Signal Generator, Amplifier, Filter, Coupler, and Computer.

COMOSAR is a system that is able to determine the SAR distribution inside a phantom of human being according to different standards. The COMOSAR system consists of the following items:

• Main computer to control all the system
• 6 axis robot
• Data acquisition system
• Miniature E-field probe
• Phone holder
• Head simulating tissue

The following figure shows the system.

An image displays the MVG COMOSAR system setup with the EUT placed in the phantom.

The EUT under test operating at the maximum power level is placed in the phone holder, under the phantom, which is filled with head simulating liquid. The E-Field probe measures the electric field inside the phantom. The OpenSAR software computes the results to give a SAR value in a 1g or 1g mass.

3.2.1 Probe

For the measurements the Specific Dosimetric E-Field Probe SN 04/22 EPGO364 with following specifications is used:

• Probe Length: 330 mm
• Length of Individual Dipoles: 2mm
• Maximum external diameter: 8 mm
• Probe Tip External Diameter: 2.5 mm
• Distance between dipole/probe extremity: 1 mm
• Dynamic range: 0.01-100 W/kg
• Probe linearity: 3%
• Axial Isotropy: <0.10 dB
• Spherical Isotropy: <0.10 dB
• Calibration range: 600 MHz to 6 GHz for head & body simulating liquid.
• Angle between probe axis (evaluation axis) and surface normal line: less than 30°

Figure 1-MVG COMOSAR Dosimetric E field Probe: An image of the probe is shown.

3.2.2 Phantom

For the measurements the Specific Anthropomorphic Mannequin (SAM) defined by the IEEE SCC-34/SC2 group is used. The phantom is a polyurethane shell integrated in a wooden table. The thickness of the phantom amounts to 2mm +/- 0.2mm. It enables the dosimetric evaluation of left and right phone usage and includes an additional flat phantom part for the simplified performance check. The phantom set-up includes a cover, which prevents the evaporation of the liquid.

Figure-SN 06/22 SAM 148: An image of the SAM phantom is shown.

Figure-SN 06/22 ELLI 51: An image of the flat phantom is shown.

3.2.3 Device Holder

The SAR in the phantom is approximately inversely proportional to the square of the distance between the source and the liquid surface. For a source at 5 mm distance, a positioning uncertainty of ± 0.5 mm would produce a SAR uncertainty of ± 20 %. Accurate device positioning is therefore crucial for accurate and repeatable measurements. The positions in which the devices must be measured are defined by the standards.

4. Tissue Simulating Liquids

4.1 Simulating Liquids Parameter Check

The simulating liquids should be checked at the beginning of a series of SAR measurements to determine of the dielectric parameters are within the tolerances of the specified target values.

The uncertainty due to the liquid conductivity and permittivity arises from two different sources. The first source of error is the deviation of the liquid conductivity from its target value (max _ 5 %) and the second source of error arises from the measurement procedures used to assess conductivity. The uncertainty shall be assessed using a rectangular probability For 1 g averaging, the maximum weighting coefficient for SAR is 0,5.

IEEE SCC-34/SC-2 RECOMMENDED TISSUE DIELECTRIC PARAMETERS

The head and body tissue dielectric parameters recommended by the IEEE SCC-34/SC-2 have been incorporated in the following table.

LIQUID MEASUREMENT RESULTS

5. SAR System Validation

5.1 Validation System

Each MVG system is equipped with one or more system validation kits. These units, together with the predefined measurement procedures within the MVG software, enable the user to conduct the system performance check and system validation. System kit includes a dipole, and dipole device holder.

The system check verifies that the system operates within its specifications. It's performed daily or before every SAR measurement. The system check uses normal SAR measurement in the flat section of the phantom with a matched dipole at a specified distance. The system validation setup is shown as below.

A diagram illustrates the SAR system validation setup, showing a signal generator, amplifier, filter, directional coupler, probe, phantom, and computer.

5.2 Validation Result

Comparing to the original SAR value provided by MVG, the validation data should be within its specification of ±10 %.

Note:

1. The tolerance limit of System validation ±10%.
2. The dipole input power (forward power) was 100 mW.
3. The results are normalized to 1 W input power.

6. SAR Evaluation Procedures

The procedure for assessing the average SAR value consists of the following steps:

The following steps are used for each test position:

• Establish a call with the maximum output power with a base station simulator. The connection between the mobile and the base station simulator is established via air interface.
• Measurement of the local E-field value at a fixed location. This value serves as a reference value for calculating a possible power drift.
• Measurement of the SAR distribution with a grid of 8 to 16mm * 8 to16 mm and a constant distance to the inner surface of the phantom. Since the sensors cannot directly measure at the inner phantom surface, the values between the sensors and the inner phantom surface are extrapolated. With these values the area of the maximum SAR is calculated by an interpolation scheme.
• Around this point, a cube of 30 * 30 * 30 mm or 32 * 32 * 32 mm is assessed by measuring 5 or 8 * 5 or 8*4 or 5 mm. With these data, the peak spatial-average SAR value can be calculated.

Area Scan & Zoom Scan

First Area Scan is used to locate the approximate location(s) of the local peak SAR value(s). The measurement grid within an Area Scan is defined by the grid extent, grid step size and grid offset. Next, in order to determine the EM field distribution in a three-dimensional spatial extension, Zoom Scan is required. The Zoom Scan is performed around the highest E-field value to determine the averaged SAR-distribution over 10 g. Area scan and zoom scan resolution setting follows KDB 865664 D01 quoted below.

When the 1-g SAR of the highest peak is within 2 dB of the SAR limit, additional zoom scans are required for other peaks within 2 dB of the highest peak that have not been included in any zoom scan to ensure there is no increase in SAR.

7. EUT Test Position

According to KDB 447498 D02, USB connector orientations on laptop computers, which is tested for SAR compliance in body-worn accessory and other use configurations described in the following subsections.

7.1 USB connector Orientations Implemented on Laptop Computers

Images depicting the USB connector orientations: Horizontal-Up, Horizontal-Down, Vertical-Front, Vertical-Back.

Note: These are USB connector orientations on laptop computers; USB dongles have the reverse configuration for plugging into the corresponding laptop computers.

8. Uncertainty

8.1 Measurement Uncertainty

The following measurement uncertainty levels have been estimated for tests performed on the EUT as specified in IEEE 1528: 2013. This uncertainty represents an expanded uncertainty expressed at approximately the 95% confidence level using a coverage factor of k=2.

8.2 System validation Uncertainty

9. Conducted Power Measurement

9.1 Test Result

WLAN (5.2Gband)

10. EUT and Test Setup Photo

10.1 EUT Photos

Images showing the front and back sides of the EUT, with a ruler for scale.

Images showing the right and left edges of the EUT, with a ruler for scale.

Images showing the top and bottom edges of the EUT, with a ruler for scale.

10.2 Setup Photos

Images showing the test setup for Horizontal-UP (separation distance is 5mm).

Images showing the test setup for Horizontal-Down (separation distance is 5mm).

Images showing the test setup for Vertical-Front (separation distance is 5mm).

Images showing the test setup for Vertical-Back (separation distance is 5mm).

An image displays the liquid depth in the phantom, measured at 15 cm.

11. SAR Result Summary

11.1 Body SAR

Note:

1. The test separation of all above table is 5mm.
2. Per KDB 447498 D01, the reported SAR is the measured SAR value adjusted for maximum tune-up tolerance.
• Tune-up scaling Factor = tune-up limit power (mW) / EUT RF power (mW), where tune-up limit is the maximum rated power among all production units.
• Scaled SAR(W/kg) = Measured SAR(W/kg) *Tune-up Scaling Factor

11.2 Repeated SAR

11.3 Repeated SAR measurement

Note:

1. Per KDB 865664 D01, for each frequency band, repeated SAR measurement is required only when the measured SAR is ≥0.8W/Kg.
2. Per KDB 865664 D01, if the ratio of largest to smallest SAR for the original and first repeated measurement is ≤1.2 and the measured SAR<1.45W/Kg, only one repeated measurement is required.
3. Perform a second repeated measurement only if the ratio of largest to smallest SAR for the original and first repeated measurements is >1.20 or when the original or repeated measurement is ≥1.45W/Kg.
4. The ratio is the difference in percentage between original and repeated measured SAR.

12. Equipment List

Appendix A. System Validation Plots

System Performance Check Data (5200MHz)

Type: Phone measurement (Complete)

Area scan resolution: dx=8mm, dy=8mm

Zoom scan resolution: dx=4mm, dy=4mm, dz=2mm

Date of measurement:2025-06-20

Experimental conditions.

SURFACE SAR

An image displays the SURFACE SAR plot.

VOLUME SAR

An image displays the VOLUME SAR plot.

Maximum location: X=0.00, Y=0.00 ; SAR Peak: 28.91 W/kg

SAR 10g (W/Kg): 2.359

SAR 1g (W/Kg): 8.131

An image displays the Z Axis Scan plot.

Appendix B. SAR Test Plots

Plot 1:

Appendix C. Probe Calibration and Dipole Calibration Report

Refer the appendix Calibration Report.

※※※※※END OF THE REPORT※※※※※