1. Introduction
Thank you for choosing the Monster Shock Plus Portable Bluetooth Speaker S21. This manual provides essential information for setting up, operating, and maintaining your speaker. Please read it thoroughly before use to ensure optimal performance and longevity of your device.
The Monster Shock Plus S21 is designed to deliver powerful, clear audio with deep bass, featuring Bluetooth 6.0 connectivity, IPX6 water resistance, and versatile playback options for both indoor and outdoor environments.
2. Package Contents
Ensure all items listed below are present in your package. If any items are missing or damaged, please contact customer support.
- Monster Shock Plus Portable Bluetooth Speaker x1
- Lifting Rope x1
- AUX IN Cable x1
- USB-C Charging Cable x1
- Quick Start Guide & Warning Card x1
Image: Contents of the Monster Shock Plus package, including the speaker, lifting rope, AUX cable, USB-C charging cable, and documentation.
3. Product Overview
3.1 Speaker Components
Image: Top view of the Monster Shock Plus speaker showing the control buttons.
- Power Button: Press and hold to turn the speaker on or off.
- Play/Pause Button: Press to play or pause audio.
- TWS Pairing Button: Press to initiate True Wireless Stereo pairing.
- Volume + Button: Press to increase volume.
- Volume - Button: Press to decrease volume.
3.2 Ports and Connectivity
Image: Side view of the Monster Shock Plus speaker with its protective flap open, revealing the AUX-IN, TF Card, USB, and Type-C charging ports.
- AUX-IN Port: For wired audio connection using the provided 3.5mm AUX cable.
- TF Card Slot: Insert a TF (MicroSD) card for direct audio playback.
- USB Port: Connect a USB drive for direct audio playback.
- Type-C Charging Port: For charging the speaker using the USB-C cable.
4. Setup
4.1 Initial Charging
Before first use, fully charge your Monster Shock Plus speaker. Connect the provided USB-C charging cable to the speaker's Type-C port and the other end to a USB power adapter (not included) or a computer's USB port. The charging indicator light will show the charging status and turn off when fully charged.
4.2 Powering On/Off
- To Power On: Press and hold the Power button for approximately 2-3 seconds until you hear an audible prompt and the indicator light illuminates.
- To Power Off: Press and hold the Power button for approximately 2-3 seconds until you hear an audible prompt and the indicator light turns off.
5. Operating Instructions
5.1 Bluetooth Pairing
The Monster Shock Plus S21 features Bluetooth 6.0 for stable and efficient wireless connection.
- Ensure the speaker is powered on and in Bluetooth pairing mode. The Bluetooth indicator light will flash, indicating it is ready to pair.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "Monster Shock Plus" from the list of devices.
- Once connected, you will hear an audible confirmation, and the Bluetooth indicator light will remain solid.
Image: The Monster Shock Plus speaker with an overlay illustrating Bluetooth 6.0 technology and its benefits like stable connection and lower power consumption.
5.2 True Wireless Stereo (TWS) Pairing
For an enhanced stereo sound experience, you can pair two Monster Shock Plus S21 speakers together.
- Ensure both speakers are powered on and not connected to any other Bluetooth device.
- On one speaker (this will be the primary speaker), press the TWS Pairing button. You will hear a prompt indicating TWS pairing mode.
- The two speakers will automatically search for and connect to each other. Once paired, you will hear a confirmation sound.
- Now, connect your device to the primary speaker via Bluetooth as described in Section 5.1. Both speakers will play audio in stereo.
Image: Two Monster Shock Plus speakers wirelessly connected, demonstrating the True Wireless Stereo pairing feature for an 80W stereo sound experience.
5.3 AUX-IN Playback
Connect non-Bluetooth devices using the 3.5mm AUX cable.
- Connect one end of the 3.5mm AUX cable to the speaker's AUX-IN port.
- Connect the other end to the audio output jack of your device.
- The speaker will automatically switch to AUX mode.
5.4 TF Card / USB Playback
Play audio directly from a TF (MicroSD) card or USB drive.
- Insert a TF card into the TF card slot or a USB drive into the USB port.
- The speaker will automatically detect the storage device and begin playing audio files.
Image: A detailed view of the Monster Shock Plus speaker's connectivity options, showing an AUX cable, a TF card, and a USB drive inserted into their respective ports.
5.5 Hands-free Calling
When connected via Bluetooth to your smartphone, the speaker can be used for hands-free calls.
- Answer Call: Press the Play/Pause button once.
- End Call: Press the Play/Pause button once during a call.
- Reject Call: Press and hold the Play/Pause button for 2 seconds.
5.6 Volume Control
- Increase Volume: Press the Volume + button.
- Decrease Volume: Press the Volume - button.
Note: The system sounds (power on/off, pairing) are fixed at a certain volume level and cannot be adjusted independently from media playback volume. Please be mindful of this when operating the speaker in quiet environments.
6. Charging
The Monster Shock Plus S21 is equipped with a built-in rechargeable battery. To charge the speaker:
- Open the protective flap covering the charging port.
- Connect the USB-C end of the charging cable to the speaker's Type-C port.
- Connect the standard USB end of the cable to a USB power source (e.g., wall adapter, computer USB port, power bank).
- The charging indicator will illuminate during charging and turn off when the battery is full.
A full charge provides approximately 20 hours of playtime at 50% volume. Battery life may vary based on volume level and audio content.
Image: The Monster Shock Plus speaker shown in outdoor settings, illustrating its 20-hour battery life for continuous music playback.
7. Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the speaker. Do not use abrasive cleaners or solvents.
- Water Resistance: The speaker is IPX6 water-resistant, meaning it can withstand strong water jets. Ensure the protective flap covering the ports is securely closed before exposing the speaker to water. Do not submerge the speaker in water.
- Storage: Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Charge the speaker regularly, even if not in use for extended periods.
Image: The Monster Shock Plus speaker placed on a rock near flowing water, highlighting its IPX6 waterproof capability for outdoor use.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on. | Low battery. | Charge the speaker fully. |
| Cannot pair via Bluetooth. | Speaker not in pairing mode; device Bluetooth off; too far from speaker. | Ensure speaker is in pairing mode (flashing indicator). Turn Bluetooth on your device. Move device closer to speaker (within 10 meters). Forget "Monster Shock Plus" on your device and try pairing again. |
| No sound. | Volume too low; incorrect input mode; device not playing. | Increase speaker and device volume. Ensure correct input mode (Bluetooth, AUX, TF, USB). Check if audio is playing on your source device. |
| Sound distortion. | Volume too high; low battery; poor audio source. | Reduce volume on speaker and device. Charge the speaker. Try a different audio source or file. |
| TWS pairing fails. | Speakers already connected to other devices; too far apart. | Ensure both speakers are disconnected from other Bluetooth devices. Place speakers close to each other. Follow TWS pairing steps carefully. |
| System sounds are too loud. | System sounds are fixed volume. | This is a characteristic of the product. There is no independent volume control for system prompts. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | Monster S21 |
| Bluetooth Version | 6.0 |
| Audio Output Power | 40W |
| Playtime | Up to 20 hours (at 50% volume) |
| Water Resistance Rating | IPX6 |
| Connectivity Options | Bluetooth, AUX-IN, TF Card, USB |
| TWS Pairing | Supported (for two speakers) |
| Built-in Microphone | Yes (for hands-free calling) |
| Product Dimensions | 7.4 x 22 x 9 cm |
| Weight | 830 g |
10. Safety Information
- Do not expose the speaker to extreme temperatures, direct sunlight, or open flames.
- Do not disassemble, repair, or modify the speaker yourself. This may void the warranty and pose safety risks.
- Keep the speaker away from strong magnetic fields.
- Avoid dropping or subjecting the speaker to strong impacts.
- Dispose of the speaker and its battery responsibly according to local regulations.
- Do not use the speaker at excessively high volumes for prolonged periods, as this may cause hearing damage.
11. Warranty and Support
Your Monster Shock Plus Portable Bluetooth Speaker S21 is covered by a manufacturer's warranty. Please refer to the included Quick Start Guide & Warning Card for specific warranty terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact Monster customer service through the retailer where you purchased the product or visit the official Monster website for contact information.
Website: www.monsterproducts.com