Introduction
The INSIGNIA Portable Bluetooth Audio Receiver NS-MBTK35 allows you to wirelessly stream audio from your Bluetooth-enabled devices to any audio system with a 3.5mm or RCA input. Enjoy crystal clear sound and hands-free calling with this versatile receiver. Its compact design and built-in rechargeable battery make it ideal for use at home or on the go.
What's Included
- INSIGNIA Portable Bluetooth Audio Receiver
- 3.5 mm Audio Cable (3 ft.)
- 3.5 mm Male-to-Male Adapter
- 3.5 mm to RCA Adapter
- Micro USB Charging Cable
- Carrying Pouch
- Velcro Mounting Pads
Product Overview
Familiarize yourself with the receiver's controls and ports.

Image: Front view of the INSIGNIA Portable Bluetooth Audio Receiver, showing the control buttons: Reverse/Volume-, Call/Play/Pause, and Skip/Volume+.
Controls:
- Call/Play/Pause Button: Powers the device on/off, plays/pauses audio, answers/ends calls.
- Reverse/Volume- Button: Skips to the previous track or decreases volume.
- Skip/Volume+ Button: Skips to the next track or increases volume.
- Microphone: For hands-free calling.
- 3.5mm Audio Output: Connects to your audio system.
- Micro USB Charging Port: For charging the internal battery.
Charging the Receiver
Before first use, fully charge the receiver. A full charge provides up to 6 hours of operation.
- Connect the small end of the included Micro USB charging cable to the Micro USB port on the receiver.
- Connect the large end of the Micro USB charging cable to a USB power source (e.g., computer USB port, USB wall adapter).
- The LED indicator will illuminate during charging and turn off when charging is complete.

Image: A black Micro USB charging cable, used to power the receiver.
Setup
Connecting to an Audio System:
The receiver can connect to your audio system using either a 3.5mm audio cable or an RCA adapter.
- Using the 3.5mm Audio Cable: Connect one end of the 3.5mm audio cable to the receiver's 3.5mm audio output port. Connect the other end to the 3.5mm auxiliary input on your audio system (e.g., car stereo, home speaker).
- Using the 3.5mm to RCA Adapter: If your audio system has RCA inputs (red and white), connect the 3.5mm male-to-male adapter to the receiver's 3.5mm audio output. Then, connect the 3.5mm male-to-male adapter to the 3.5mm female end of the RCA adapter. Finally, connect the red and white RCA plugs to the corresponding RCA input jacks on your audio system.

Image: A black 3.5 mm audio cable with L-shaped and straight connectors.

Image: A 3.5 mm female to dual RCA male adapter cable (red and white).
Mounting the Receiver:
Use the included Velcro mounting pads to secure the receiver in a convenient location, such as on a dashboard or near your audio system.

Image: Two circular white Velcro mounting pads with 3M branding.
Operating Instructions
Powering On/Off:
- To Power On: Press and hold the Call/Play/Pause button for approximately 3 seconds until the LED indicator flashes.
- To Power Off: Press and hold the Call/Play/Pause button for approximately 3 seconds until the LED indicator turns off.
Pairing with a Bluetooth Device:
The receiver can be paired with up to eight different Bluetooth devices.
- Ensure the receiver is powered on and in pairing mode (LED indicator will flash rapidly). If it's not in pairing mode, press and hold the Call/Play/Pause button until it enters pairing mode.
- Enable Bluetooth on your audio source device (e.g., smartphone, tablet).
- Search for available Bluetooth devices on your audio source device.
- Select "NS-MBTK35" from the list of found devices.
- Once paired, the LED indicator on the receiver will glow solid blue.
Playing Audio:
- Play/Pause: Press the Call/Play/Pause button.
- Volume Up: Press the Skip/Volume+ button.
- Volume Down: Press the Reverse/Volume- button.
- Next Track: Press and hold the Skip/Volume+ button.
- Previous Track: Press and hold the Reverse/Volume- button.
Hands-Free Calling:
The built-in microphone allows you to make and receive calls.
- Answer Call: Press the Call/Play/Pause button when a call comes in.
- End Call: Press the Call/Play/Pause button during a call.
- Reject Call: Press and hold the Call/Play/Pause button when a call comes in.
Maintenance
- Keep the receiver dry. Avoid exposure to moisture or liquids.
- Clean the receiver with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid extreme temperatures, direct sunlight, and dusty environments.
- Do not attempt to disassemble or modify the receiver. This will void the warranty.
Troubleshooting
| Problem | Solution |
|---|---|
| Receiver does not power on. | Ensure the battery is charged. Connect the receiver to a power source using the Micro USB cable. |
| Cannot pair with a Bluetooth device. | 1. Ensure the receiver is in pairing mode (flashing LED). 2. Make sure Bluetooth is enabled on your audio source device. 3. Place the receiver and your device within 30 feet (10 meters) of each other. 4. Turn off and on both devices and try pairing again. |
| No sound or poor sound quality. | 1. Check all cable connections between the receiver and your audio system. 2. Ensure the volume on both the receiver and your audio source device is turned up. 3. Make sure the receiver is within range of your Bluetooth device and there are no significant obstacles. 4. Verify that your audio system is set to the correct input source (e.g., AUX). |
| Calls are not clear. | Ensure the microphone is not obstructed and you are speaking clearly towards the receiver. Reduce background noise if possible. |
Specifications
| Brand | INSIGNIA |
| Model Number | NS-MBTK35 |
| Connectivity Technology | Bluetooth, RCA, USB |
| Wireless Technology | Bluetooth |
| Wireless Range | Up to 30 feet (10 meters) |
| Audio Output Mode | Stereo |
| Compatible Devices | Smartphone, Speaker |
| Special Feature | Built-in Microphone for hands-free calls |
| Battery Life | Up to 6 hours (on a full charge) |
| Color | Black |
| UPC | 600603206559 |
Safety Information
- Read these instructions carefully before using your new product.
- Keep these instructions for future reference.
- Do not expose the receiver to water, rain, or moisture.
- Do not place the receiver near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Only use attachments/accessories specified by the manufacturer.
- Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way.
Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or visit the official INSIGNIA website. Keep your purchase receipt for warranty claims.