Product Information
Applicant: SHENZHEN LOFREE CULTURE CO., LTD.
Product name: Fresnel Dual Mode Mechanical Keyboard
Model(s): OE907
FCC ID: 2AC59-OE907
Instructions for Report Usage
- The report shall not be partially reproduced without the written consent of the laboratory.
- The test results of this report are only responsible for the samples submitted.
- This report is invalid without the seal and signature of the laboratory.
- This report is invalid if transferred, altered or tampered with in any form without authorization.
- Any objection to this report shall be submitted to the laboratory within 15 days from the date of receipt of the report.
Test Result Certification
Applicant: SHENZHEN LOFREE CULTURE CO., LTD.
Applicant Address: NO.103-104, F8 Building, F518 IDEA LAND, Baoyuan Road, Xixiang, Baoan District, Shenzhen, China
Manufacturer: SHENZHEN LOFREE CULTURE CO., LTD.
Manufacturer Address: NO.103-104, F8 Building, F518 IDEA LAND, Baoyuan Road, Xixiang, Baoan District, Shenzhen, China
Factory: ZHUHAI HENGCANG ELECTRONIC TECHNOLOGY CO., LTD.
Factory Address: A building, No. 7 of 3rd pingxi Road, Nanping Technical industry park, Zhuhai, China
Product description: Fresnel Dual Mode Mechanical Keyboard
Trademark: Lofree
Model Name: OE907
Serial Model: N/A
Standards: N/A
Test procedure: KDB 447498 D01 v06
Date(s) of performance of tests: 2022-04-27 ~ 2022-05-23
Test Result: Pass
Testing Engineer: (David Lee)
Technical Manager: (Leon Chen)
Authorized Signatory: (Tom Xue)
1. Standalone SAR Test Exclusion Considerations
Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s) are satisfied.
These conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions.
The minimum test separation distance is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, to any part of the body or extremity of a user or bystander.
To qualify for SAR test exclusion, test separation distances must be fully explained and justified, typically in the SAR measurement or SAR analysis report.
Exclusion Thresholds:
- For 100 MHz to 6 GHz and test separation distances <= 50 mm:
- For 100 MHz to 6 GHz and test separation distances > 50 mm:
- For 100 MHz to 1500 MHz: {[Power allowed at numeric threshold for 50 mm] + [(test separation distance – 50 mm)·(f(MHz)/150)]} mW
- For > 1500 MHz and ≤ 6 GHz: {[Power allowed at numeric threshold for 50 mm] + [(test separation distance – 50 mm)·10]} mW
- For frequencies below 100 MHz:
- For test separation distances > 50 mm and < 200 mm, the power threshold is multiplied by [1 + log(100/f(MHz))].
- For test separation distances ≤ 50 mm, the power threshold is multiplied by ½.
The 1-g and 10-g SAR test exclusion thresholds are determined by: [(max. power of channel, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR.
SAR measurement procedures are not established below 100 MHz. When SAR test exclusion cannot be applied, a KDB inquiry is required.
2. SAR Test Exclusion Thresholds
A separation distance of 5mm was used for calculation.
Bluetooth DSS:
| Transmit Frequency (GHz) | Mode | Measured Power (dBm) | Tune-up power (dBm) | Max tune-up power(dBm) | Result calculation | 1g SAR |
|---|---|---|---|---|---|---|
| 2.402 | GFSK | -1.14 | (-2)±1 | -1 | 0.2462 | 3 |
| 2.441 | GFSK | -2.07 | (-2)±1 | -1 | 0.2482 | 3 |
| 2.480 | GFSK | -1.98 | (-2)±1 | -1 | 0.2502 | 3 |
Conclusion: For the max result: 0.2502 ≤ 3.0 for 1g SAR, No SAR is required.
