Internal Photos of the EUT - FCC ID: 2AFKR-S67

Overall Internal Assembly

Figure 1: Internal Speaker Configuration

The internal view reveals a speaker system comprising three drivers arranged vertically within a black enclosure. The top and middle drivers appear to be mid-range or tweeter units, while the bottom driver is larger, likely a woofer. The second view shows the rear of the enclosure, highlighting the internal wiring and mounting points.

Internal Components Layout

Figure 2: Main Internal Components

This image displays the primary internal components of the device. A rechargeable lithium-ion battery pack is visible alongside the main circuit board. Wiring connects these components, indicating the power source and control circuitry.

Figure 3: Internal View with Battery and Circuit Board

Similar to Figure 2, this view offers a clear perspective of the battery pack and the main printed circuit board (PCB) within the device's housing.

Rechargeable Battery Pack

Figure 4 & 5: Lithium-Ion Battery Pack Details

The rechargeable lithium-ion battery pack is a blue unit with a label providing essential specifications and warnings in Chinese. The product model is identified as 18650-1P4S-1800-0.5C. It has a nominal voltage of 7.4V and a rated capacity of 7200mAh (53.28Wh). The battery adheres to the standard GB/T18287-2013 and was produced on 2024-01-20. The manufacturer is Dongguan Youjiang Electronics Technology Co., Ltd.

Battery Warnings:

• Do not disassemble, impact, squeeze, or throw into fire. [?]
• If severe bulging occurs, do not continue to use. [⚠️]
• Avoid placing in environments exceeding 60°C. [?️]
• Avoid use in humid or corrosive environments. [?]
• Do not use after the battery has been immersed in water. [??]

Printed Circuit Boards (PCBs)

Figure 6: Control/Daughter Board

This image shows a smaller circuit board, likely a control or daughter board. It features various components and labels such as "POWER", "TWS", "MODE", "PLAY", "V-", "V+", and indicator LEDs (green and orange lights mentioned in OCR). The board is marked with "S67-K-V1.2 2022.06.15".

Figure 7 & 8: Main Circuit Board (Front and Back)

These figures present the main printed circuit board (PCB). The front side (Fig 8) shows numerous electronic components including integrated circuits (ICs), capacitors (e.g., "470 10V", "C121", "C123"), resistors (e.g., "R7", "R2"), and connectors. The back side (Fig 7) shows fewer components but confirms the board's layout.

Figure 9 & 10: Main Board / Sub-Board Details

These images provide further views of a circuit board, possibly the main board or a significant sub-board. Key connectors are labeled: "CON2", "BASS", "+SPR-", "+SPL-". The board model number "KRZ-S67-M-V1.5 2023/07/21 2402" is clearly visible. Other important labels include "CHLED", "OLED", "GLED", "MIC", and "BT Antenna". A prominent IC chip is identified as "JL AC73BP1W264-51C8".

Testing Laboratory Information

The testing was conducted by Shenzhen LCS Compliance Testing Laboratory Ltd., located at 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China. Contact information includes Tel: +(86) 0755-82591330, E-mail: webmaster@lcs-cert.com, and Web: www.lcs-cert.com. A QR code is provided for authenticity verification.