1. Product Overview
This manual provides instructions for the safe and effective use of your CJP-Geek AC Adapter Charger, designed as a replacement power supply for the Brookstone Big Blue Studio Wireless Speaker requiring 18V power.

Image: The CJP-Geek AC Adapter Charger, showing the main power brick, detachable AC input cable, and DC output cable with a barrel connector.
2. Important Safety Information
Please read all safety warnings and instructions carefully before using this product. Failure to follow these instructions may result in electric shock, fire, or other hazards.
- Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
- Ensure the adapter's power consumption does not exceed the maximum output of your device.
- Verify the DC socket type and polarity of your device before connecting to prevent damage.
- Do not expose the adapter to water or excessive moisture.
- Do not disassemble or attempt to repair the adapter.
- Disconnect from the power outlet when not in use.

Image: Visual representation of the adapter's built-in safety features, including protection against overload, over voltage, over charge, over current, short circuit, and temperature fluctuations.
3. Setup
Follow these steps to properly set up your CJP-Geek AC Adapter Charger:
- Verify Compatibility: Before connecting, confirm that your device, specifically the Brookstone Big Blue Studio Wireless Speaker, requires an 18V power supply and has a compatible DC input jack. Check the device's specifications for voltage and current requirements.
- Connect AC Cable: Plug the detachable AC power cord into the adapter's input port.
- Connect DC Cable: Insert the DC output barrel connector firmly into the power input jack of your Brookstone Big Blue Studio Wireless Speaker.
- Plug into Outlet: Plug the AC power cord into a standard wall outlet (100-240V AC).
Warning:
Please check the DC socket type, power consumption (must not exceed the Max output of the adapter), and polarity of the device before connecting. Incorrect usage may cause problems or damage the device.
4. Operating Instructions
Once properly connected, the adapter will supply power to your Brookstone Big Blue Studio Wireless Speaker. No additional steps are required for operation.
- Ensure the adapter is placed in a well-ventilated area to prevent overheating.
- Avoid covering the adapter during operation.

Image: A detailed view of the adapter's label, displaying its model number (CJP-Geek-PSA-20220719-461), input voltage (100-240V), and output voltage/current (18V, 4A).
5. Maintenance
The CJP-Geek AC Adapter Charger requires minimal maintenance to ensure its longevity and safe operation.
- Keep the adapter clean and free from dust. Use a dry, soft cloth for cleaning.
- Store the adapter in a cool, dry place when not in use.
- Regularly inspect the cables for any signs of damage, fraying, or exposed wires. If damage is found, discontinue use immediately and replace the adapter.
6. Troubleshooting
If your device is not receiving power or you encounter other issues, consider the following:
- No Power:
- Check if the AC power cord is securely plugged into both the wall outlet and the adapter.
- Ensure the DC barrel connector is fully inserted into your speaker's power input.
- Test the wall outlet with another device to confirm it is functional.
- Device Damage:
- If the adapter's specifications (voltage, current, polarity) do not match your device's requirements, it could cause damage. Always verify compatibility before use.
- Overheating:
- If the adapter feels excessively hot, disconnect it immediately. Ensure it is in a well-ventilated area and not covered. Overheating can indicate an issue with the adapter or an incompatible load.
If problems persist after following these steps, please contact customer support.
7. Specifications

Image: An illustration detailing the adapter's dimensions and highlighting the stable copper interface for reliable connection.
| Feature | Detail |
|---|---|
| Brand | CJP-Geek |
| Model Number | CJP-Geek-PSA-20220719-461 |
| Input Voltage | 100-240 Volts AC |
| Output Voltage | 18 Volts DC |
| Output Current | 4 Amps (Max) |
| Connector Type | DC Barrel Connector |
| Compatible Devices | Brookstone Big Blue Studio Wireless Speaker (18V) |
| Product Dimensions | 4 x 3 x 4 inches (Adapter unit) |
| Item Weight | 5 ounces |
| Special Features | Over Voltage Protection, Over Current Protection, Short Circuit Protection, Input Protection |
| Color | Black |
8. Warranty Information
For warranty details, please refer to the official CJP-Geek website or contact the seller directly. Warranty terms and conditions may vary based on your region and point of purchase.
9. Support
If you have any questions or require assistance with your CJP-Geek AC Adapter Charger, please contact CJP-Geek customer support through their official channels or the retailer from whom you purchased the product.
You can visit the CJP-Geek Store on Amazon for more information and contact options.