RF Exposure Requirements

General Information

Client Information

• Applicant: Shenzhen Qianyan Technology LTD
• Address of applicant: No.3301, Block C, Section 1, Chuangzhi Yuncheng Building, Liuxian Avenue, Xili Community, Xili Street, Nanshan District, Shenzhen, China
• Manufacturer: Shenzhen Qianyan Technology LTD
• Address of manufacturer: No.3301, Block C, Section 1, Chuangzhi Yuncheng Building, Liuxian Avenue, Xili Community, Xili Street, Nanshan District, Shenzhen, China

General Description of EUT

• Product Name: Smart Aroma Diffuser
• Trade Name: GoveeLife
• Model No.: H7161
• Adding Model(s): H7162
• Rated Voltage: DC24V
• Power Adapter: Model:HCX2401-2400750U, Input:AC100-240V~ 50-60Hz 0.8A, Output:DC24V,0.75A
• FCC ID: 2A7VD-H7161
• Equipment Type: Fixed device

Technical Characteristics of EUT

Bluetooth

Wi-Fi

RF Exposure Exemption

According to §1.1307(b)(3) and KDB 447498 D04 Interim General RF Exposure Guidance v01, the system must operate in a manner that the public is not exposed to radio frequency energy levels exceeding the maximum permissible exposure limits.

Option A: FCC Rule Part 1.1307 (b)(3)(i)(A)

The available maximum time-averaged power is no more than 1mW, regardless of separation distance.

Option B: FCC Rule Part 1.1307 (b)(3)(i)(B)

The available maximum time-averaged power or effective radiated power (ERP), whichever is greater, is less than or equal to the threshold Pth (mW). Pth is determined by ERP20 cm and separation distance 'd'. For d ≤ 20 cm, Pth (mW) is proportional to d; for 20 cm < d ≤ 40 cm, Pth (mW) equals ERP20 cm. The value of ERP20 cm (mW) depends on the frequency 'f' in GHz, with specific formulas for different frequency ranges. The variable 'd' represents the separation distance in centimeters.

Option C: FCC Rule Part 1.1307 (b)(3)(i)(C)

The minimum separation distance (R in meters) from a nearby person for a given frequency (f in MHz) must ensure the ERP (watts) does not exceed the calculated value. R must be at least λ/2π, where λ is the free-space operating wavelength in meters. Specific threshold ERP values based on frequency and R are provided in the table below.

Single RF Sources Subject to Routine Environmental Evaluation

Calculated Result

For Multiple RF sources: FCC Rule Part 1.1307(b)(3)(ii)

(A)

The available maximum time-averaged power of each source must be no more than 1 mW, with a separation distance of two centimeters between any radiating structure and any other radiating structure in the same device. An exception applies if the sum of multiple sources is less than 1 mW during the time-averaging period, allowing them to be treated as a single source without separation requirements.

(B)

For fixed or multiple mobile/portable RF sources operating in the same time-averaging period, the sum of the fractional contributions to the applicable thresholds must be less than or equal to 1, as indicated by the following equation: Σ (Pi / Pth,i) + Σ (ERPj / ERPth,j) + Σ (Evaluatedk / Exposure Limitk) ≤ 1

Note:

1. Time-Averaged Power = Output Power × Duty Cycle; ERP = Time-Averaged Power + Antenna gain - 2.15dB.
2. Option A, B and C refer to clause 1.2.
3. For option B, Max (time-averaged power, effective radiated power (ERP)) converts to Max. Power. For option C, ERP converts to Max. Power.
4. For option B, Pth (mW) converts to Exposure Limit (mW); For option C, ERP (W) converts to Exposure Limit (mW).
5. Ratio = Tune-Up ERP (mW) / Exposure Limit (mW).

Mode for Simultaneous Multi-band Transmission

Note: Bluetooth and Wi-Fi cannot transmit at the same time.

Result: Pass