ESPWROOM02 Wi-Fi Internet of Things Module RF Exposure Info Users Manual

Report No.: RXA1503-0042MPE01 Page 1 of 5

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MPE REPORT Product Name Wi-Fi Internet of Things Module Model ESP-WROOM-02 Brand Name WROOM FCC ID 2AC7Z-ESPWROOM02 Applicant ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD Manufacturer ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD Date of issue April 10, 2015 Revised by Jiangpeng Lan SAR Manager Performed by Liang Ye SAR Engineer Approved by Kai Xu Director Test By Company:

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TA Technology (Shanghai) Co., Ltd. No.145, Jintang Rd, Tangzhen Industry Park, Pudong Shanghai,China Xu Kai

+86-021-50791141/2/3

+86-021-50791141/2/3-8000 http://www.ta-shanghai.com yangweizhong@ta-shanghai.com Report No.: RXA1503-0042MPE01 Page 2 of 5 TA Technology (Shanghai)Co.,Ltd. Test Report Maximum Permissible Exposure Type of EUT: Wi-Fi Internet of Things Module FCC ID: 2AC7Z-ESPWROOM02 Manufacturer: ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD Model: ESP-WROOM-02 Maximum conducted output power (measured) and antenna Gain:

Band 802.11b 802.11g 802.11n(20M) Output Power(dBm) 22.23 21.57 22.04 Band 802.11b 802.11g 802.11n(20M) maximum tune up procedure Antenna Gain

(dBm) 23 23 23.5

(dBi) 2 2 2 According to section 1.1310 of FCC 47 CFR Part 1, limits for maximum permissible exposure (MPE) are as following TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1503-0042MPE01 Page 3 of 5 Note1. Occupational/controlled limits apply in situations in which persons are exposed as a consequence of their employment provided those persons are fully aware of the potential for exposure and can exercise control over their exposure. Limits for occupational/controlled exposure also apply in situations when an individual is transient through a location where occupational / controlled limits apply provided he or she is made aware of the potential for exposure. Note2: General population/uncontrolled exposures apply in situations in which the general public may be exposed, or in which persons that are exposed as a consequence of their employment may not be fully aware of the potential for exposure or can not exercise control over their exposure. TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1503-0042MPE01 Page 4 of 5 The maximum permissible exposure for 300~1500MHz is f/1500, 1500~100,000MHz is f/1500.So Band 802.11b/g/n The maximum permissible exposure 1 mW/cm IMPORTANT NOTE: To comply with the FCC RF exposure compliance requirements, the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. No change to the antenna or the device is permitted. Any change to the antenna or the device could result in the device exceeding the RF exposure requirements and void users authority to operate the device. TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1503-0042MPE01 Page 5 of 5 RF Exposure Calculations:

The following information provides the minimum separation distance for the highest gain antenna provided. This calculation is based on the conducted power, considering maximum power and antenna gain. The formula shown in KDB 865664 D01 is used in the calculation. Equation from KDB 865664 D01, Edition 97-01 is:

S= PG / 4R2 where: S = power density (in appropriate units, e.g. mW/cm2) P = Time-average maximum tune up procedure (in appropriate units, e.g., mW) G = the numeric gain of the antenna R = distance to the center of radiation of the antenna (20 cm = limit for MPE) So, the numeric gain (G) of the antenna with a gain specified in dB is determined by Numeric gain (G)=10^(antenna gain/10)=10^(2/10)=1.58 dB 802.11b PG = 23dBm+ (1.58dB) =24.58dBm=287mW 802.11g PG = 23dBm+ (1.58dB) =24.58dBm= 287mW 802.11n(20M) PG = 23.5dBm+(1.58dB)=25.08dBm= 322mW R =20 cm

= 3.1416 Solving for S, the power density at 20 cm is Test Result (mW/cm2) Band 802.11b 802.11g 802.11n(20M) 0.06 0.06 0.06 Limit Value (mW/cm2) 1 mW/cm 1 mW/cm 1 mW/cm Note: For mobile or fixed location transmitters, minimum separation distance is 20cm, even if calculations indicate MPE distance is less.