EXPOSURE REPORT
FCC ID: 2AQ2W-B80
Date of issue: Sept. 15, 2018
Report Details
Report Number: MTi180912E065
Sample Description: WIRELESS CHARGER BLUETOOTH SPEAKER
Model(s): B80, B81, B82, B83, B84, B85, B86, B87, B88, B89, B90, B91, B92, B93, B94, B95, B96, B97, B98, B99
Applicant: Shenzhen Doageas Technology Co., Ltd.
Address: 5/F, 4th Bldg, Hedian Industrial Park, Guanlan, Longhua, Shenzhen, Guangdong 518110, China.
Date of Test: Aug. 17, 2018 – Sept. 15, 2018
Testing Laboratory: Shenzhen Microtest Co., Ltd. (http://www.mtitest.com)
General Information
Product name: WIRELESS CHARGER BLUETOOTH SPEAKER
Brand name: DOAGEAS
Model name: B80
Series model: B81, B82, B83, B84, B85, B86, B87, B88, B89, B90, B91, B92, B93, B94, B95, B96, B97, B98, B99
Deference in serial model: All the models are the same circuit and RF module, except external wiring.
Operation frequency: 115–205 kHz
Operational mode: Wireless charging
Modulation type: Load modulation
Antenna type: Coil Antenna
Power source: DC 3.7V from Battery or DC 5V from adapter
Battery: DC 3.7V 300mAh
Adapter information: N/A
Ancillary Equipment List
| Equipment | Model | S/N | Manufacturer |
|---|---|---|---|
| Adapter | HW-050100E01 | / | HUAWEI |
Measurement Uncertainty
Measurement Uncertainty for a Level of Confidence of 95 %, U=2xUc(y)
| Parameter | Uncertainty |
|---|---|
| Radiated emission(150kHz~30MHz) | ± 2.5 dB |
| Radiated emission(30MHz~1GHz) | ± 4.2 dB |
| Radiated emission (above 1GHz) | ± 4.3 dB |
| Temperature | ±1 degree |
| Humidity | ±5% |
Testing Site Information
Test Site: Shenzhen Microtest Co., Ltd
Test Site Location: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China
FCC Registration No.: 448573
List of Test Equipment
| Equipment No. | Equipment Name | Manufacturer | Model | Serial No. | Calibration date | Due date |
|---|---|---|---|---|---|---|
| MTI-E068 | Broadband Field Meter | Narda Safety Test Solutions GmbH | NBM-520 | D-1699 | 2018/07/13 | 2019/07/12 |
| MTI-E069 | Probe E-Field | Narda Safety Test Solutions | EF0691 | H-0571 | 2018/07/13 | 2019/07/12 |
Test Results
1.4 Maximum permissible exposure
1.4.1 Limit
The following tables define the limits for RF exposure:
(A) Limits for Occupational/Controlled Exposure
| Frequency range(MHz) | Electric field strength(V/m) | Magnetic field strength(A/m) | Power density(mW/cm²) | Averaging time(minutes) |
|---|---|---|---|---|
| 0.3-3.0 | 614 | 1.63 | *100 | 6 |
| 3.0-30 | 1842/f | 4.89/f | *900/f² | 6 |
| 30-300 | 61.4 | 0.163 | 1.0 6 | 6 |
| 300-1500 | f/300 | 6 | ||
| 1500-100000 | 5 | 6 |
Note: f = frequency in MHz, * = Plane-wave equivalent power density
(B) Limits for General Population/Uncontrolled Exposure
| Frequency range(MHz) | Electric field strength(V/m) | Magnetic field strength(A/m) | Power density(mW/cm²) | Averaging time(minutes) |
|---|---|---|---|---|
| 0.3-1.34 | 614 | 1.63 | *100 | 30 |
| 1.34-30 | 824/f | 2.19/f | *180/f² | 30 |
| 30-300 | 27.5 | 0.073 | 0.2 | 30 |
| 300-1500 | f/1500 | 30 | ||
| 1500-100000 | 1 | 30 |
Note: f = frequency in MHz, * = Plane-wave equivalent power density
1.4.2 Test Procedures
E and H-field measurements should be made with the center of the probe at a distance of 10 cm from all sides and the top of the primary/client pair. These measurements should be repeated for three different client battery levels: 1%, 50%, and 99%. The test results are recorded below.
1.4.3 Test Setup
The test setup involves a field probe positioned at specific distances relative to the device under test. The probe is oriented to measure electric (E) and magnetic (H) fields. The diagram illustrates the probe's placement relative to the device's sides (Left, Right, Top, Bottom, Front, Back). A ruler is included for scale, indicating measurement distances such as 15 cm and 20 cm.
1.4.4 Test Result
Maximum permissible Exposure (<1% Battery)
| Test sides | Test distance(cm) | E-field(V/m) | H-field(A/m) |
|---|---|---|---|
| Top | 20 | 0.414 | 0.120 |
| Bottom | 15 | 0.410 | 0.119 |
| Left | 15 | 0.409 | 0.116 |
| Right | 15 | 0.412 | 0.119 |
| Front | 15 | 0.411 | 0.118 |
| Back | 15 | 0.409 | 0.112 |
| Limit | 614 | 1.63 | |
| Margin Limit (%) | 0.067 | 7.362 |
Maximum permissible Exposure (<50% Battery)
| Test sides | Test distance(cm) | E-field(V/m) | H-field(A/m) |
|---|---|---|---|
| Top | 20 | 0.422 | 0.121 |
| Bottom | 15 | 0.409 | 0.119 |
| Left | 15 | 0.417 | 0.117 |
| Right | 15 | 0.418 | 0.109 |
| Front | 15 | 0.416 | 0.111 |
| Back | 15 | 0.411 | 0.107 |
| Limit | 614 | 1.63 | |
| Margin Limit (%) | 0.069 | 7.423 |
Maximum permissible Exposure (<99% Battery)
| Test sides | Test distance(cm) | E-field(V/m) | H-field(A/m) |
|---|---|---|---|
| Top | 20 | 0.431 | 0.119 |
| Bottom | 15 | 0.428 | 0.113 |
| Left | 15 | 0.421 | 0.107 |
| Right | 15 | 0.416 | 0.110 |
| Front | 15 | 0.420 | 0.117 |
| Back | 15 | 0.415 | 0.115 |
| Limit | 614 | 1.63 | |
| Margin Limit (%) | 0.070 | 7.301 |
1.4.5 MPE Setup Photo
A photograph shows the Maximum Permissible Exposure (MPE) test setup. A wireless charger is positioned on a stand. A spherical sensor or probe is suspended above the charger. A ruler is placed vertically next to the setup for measurement reference, indicating distances.
