This document presents an RF exposure evaluation for a wireless device with FCC ID 2BB3B-TWS231ANC. The evaluation ensures compliance with FCC regulations, specifically §15.247(i), §1.1307 (b), and KDB447498, which govern systems operating under these provisions. The goal is to confirm that the device operates in a manner that does not expose the public to radio frequency energy levels exceeding the commission's guidelines.
The evaluation utilizes the SAR-based exemption formula of §1.1307(b)(3)(i)(B) to determine if the device's effective radiated power (ERP) is below the threshold Pth (mW). This method is applicable for separation distances between 0.5 cm and 40 cm and frequencies from 0.3 GHz to 6 GHz. The document details the calculations for Pth, considering factors such as antenna gain, conducted transmit power, and duty factor. The results indicate that the source-based time-averaging conducted output power is well below the SAR low threshold level, allowing the EUT to comply with SAR requirements without testing.