This analysis report details the evaluation of a portable music box equipped with a 2.4GHz transceiver. The device operates on three channels, specifically 2411MHz, 2453MHz, and 2475MHz. Powered by three 1.5V AA batteries, the music box can pair with two other similar devices, enabling interactive music playback.
The report specifies the antenna type as an internal integral antenna with a gain of 0dBi. The nominal rated field strength is measured at 81.5dBuV/m at 3 meters (Peak), with a production tolerance of +/- 3dB. Based on KDB 447498 D04 guidelines, the maximum allowed peak field strength, including production tolerance, is calculated to be 84.5dBμV/m at 3 meters.
The analysis further assesses the device's compliance with SAR exclusion thresholds, referencing formulas and tables from relevant standards. The worst-case SAR Exclusion Threshold Level at 2.48GHz with a 5mm distance is determined to be 2.717mW. The calculated field strength for this power level is 99.6dBuV/m at 3 meters. The report concludes that the device complies with SAR requirements without further testing, as the maximum peak field strength, including production tolerance, remains below the SAR Exclusion threshold level, even with an antenna gain of >= 0.0dBi.