VAORLO K15-Pro Bluetooth 5.0 Audio Transmitter Receiver User Manual

Introduction

Thank you for purchasing the VAORLO K15-Pro Bluetooth 5.0 Audio Transmitter Receiver. This device is designed to provide versatile wireless audio connectivity, functioning as both a Bluetooth transmitter and receiver. It features an LCD display, TF card playback, hands-free calling, and broad compatibility with various audio devices. Please read this manual carefully to ensure proper use and optimal performance.

Product Overview

The VAORLO K15-Pro is a compact and multi-functional Bluetooth adapter equipped with a new Bluetooth 5.0 chip for stable transmission and lossless sound quality. Its dual system allows it to seamlessly switch between receiving (RX) and transmitting (TX) modes.

Key Features:

• Bluetooth 5.0 Chip: Ensures stable transmission, stronger signals, and lossless sound quality.
• Two-in-One Function: Operates as both a Bluetooth receiver and transmitter.
• LCD HD Digital Display: Provides clear visibility of Bluetooth mode, pairing status, and other information.
• TF Card Playback & Card Reader: Supports playing music directly from a TF card and functions as a card reader for computers.
• Built-in 170mAh Battery: Offers approximately 4-5 hours of continuous music playback and 30 days standby time.
• Hands-free Calling: Integrated HD microphone supports hands-free calls, music listening, and navigation prompts.
• Active Search Mode: In transmitting mode, it can actively search for nearby Bluetooth devices and display their names, preventing blind connections.
• Automatic Reconnection: Features a memory function that automatically reconnects to previously paired devices.
• Plug and Play: No drivers required for most functions, especially for PC.
• Wide Compatibility: Connects to TVs, PCs, car audio systems, headphones, speakers, amplifiers, and more.

Figure 1: VAORLO K15-Pro Bluetooth Adapter

Figure 2: K15-Pro Key Features

What's in the Box:

• 1 x VAORLO K15-Pro Bluetooth Audio Adapter
• 1 x 3.5mm Audio Cable
• 1 x User Manual
• 1 x Retail Package
• (Optional: 1 x RCA Audio Line, depending on selected variant)

Figure 3: Package Contents

Specifications

Figure 4: Detailed Product Specifications

Setup and Installation

1. Charging the Device

Before first use, fully charge the K15-Pro. Connect the device to a USB power source (e.g., computer USB port, USB wall charger, car charger) using a standard USB cable. The LCD display will indicate charging status. A full charge takes approximately 1 hour.

2. Power On/Off

Long press the power button (usually the central button with a power icon) for 3 seconds to turn the device ON or OFF.

3. Connecting to Audio Sources/Devices

The K15-Pro can connect to various devices depending on whether you want to transmit or receive audio.

Figure 5: K15-Pro Product Diagram and Icon Functions

For Receiving (RX Mode):

Use RX mode to receive Bluetooth audio from your phone/tablet and output it to non-Bluetooth devices like wired headphones, car stereos, or home speakers.

1. Connect the K15-Pro's 3.5mm AUX port to your non-Bluetooth audio device's AUX input using the provided 3.5mm audio cable. If your device uses RCA inputs, use an optional RCA cable.
2. Switch the K15-Pro to RX mode (refer to "Operating Instructions" for mode switching).
3. On your phone/tablet, search for Bluetooth devices and select "K15-Pro" to pair.
4. Once paired, audio from your phone will play through the connected audio device.

Figure 6: Connecting to Car Audio System (RX Mode)

Figure 7: Connecting to Active Speaker (RX Mode)

For Transmitting (TX Mode):

Use TX mode to transmit audio from non-Bluetooth devices (like TVs, PCs, MP3 players) to Bluetooth headphones or speakers.

1. Connect the K15-Pro to your audio source (e.g., TV, PC) via the 3.5mm AUX port or directly via USB (for PC).
2. Switch the K15-Pro to TX mode.
3. Put your Bluetooth headphones/speakers into pairing mode.
4. The K15-Pro will actively search for nearby Bluetooth devices and display their names on the LCD. Use the navigation buttons to select your desired device and confirm pairing.
5. Once paired, audio from your source device will be transmitted to your Bluetooth headphones/speakers.

Figure 8: Connecting to TV (TX Mode)

Figure 9: Connecting to PC (TX Mode)

Operating Instructions

Button Functions:

Figure 10: K15-Pro Button Functions

• Power Button (Central):
  • Long Press (3 seconds): Turn ON/OFF the device.
  • Short Press: Play/Pause music.
  • Double Click: Switch between RX/TX modes.
  • Short Press (Incoming Call): Answer the call.
  • Long Press (Incoming Call): Refuse the call.
• Left Button (<):
  • Short Press: Previous song.
  • Long Press: Volume down.
  • Double Click: Switch signal source (in RX mode) or navigate through search results (in TX mode).
• Right Button (>):
  • Short Press: Next song.
  • Long Press: Volume up.
  • Double Click: Start active search for Bluetooth devices (in TX mode).

Mode Switching:

Double-click the Power Button to switch between Receiving (RX) mode and Transmitting (TX) mode. The LCD display will clearly indicate the current mode.

TF Card Playback:

Insert a TF (MicroSD) card into the TF card slot. The device will automatically detect and play music files (MP3/WAV/SBC format) stored on the card. The LCD will show track information. The device also functions as a card reader when connected to a PC via USB.

Figure 11: TF Card Player and Card Reader Function

Hands-free Calling:

When in RX mode and paired with a smartphone, the built-in HD microphone allows for hands-free calls. Use the Power Button to answer, refuse, or hang up calls as described in the "Button Functions" section.

Figure 12: Hands-free Calling Operations

Memory Connection:

The K15-Pro features an intelligent memory chip. After the first successful pairing, the device will automatically reconnect to the last paired device when powered on, eliminating the need for manual re-pairing each time.

Figure 13: Intelligent Memory Function

User Tips

• Versatile Use: This adapter is highly versatile. It can be used to upgrade older car stereos or home audio systems with Bluetooth capabilities, or to enable Bluetooth headphones with devices like TVs or PCs that lack built-in Bluetooth.
• Hands-Free Convenience: The hands-free calling feature is particularly useful in cars, allowing you to manage calls safely while driving.
• TF Card for Portability: Utilize the TF card slot for standalone music playback, turning the adapter into a portable MP3 player without needing a connected phone.
• Active Search for Easy Pairing: In TX mode, use the active search function to easily find and connect to your desired Bluetooth headphones or speakers, avoiding confusion with multiple devices.

Troubleshooting

• Device not turning on: Ensure the device is fully charged. Connect it to a power source and try again.
• Cannot pair with a device:
  • Make sure the K15-Pro is in the correct mode (RX for receiving, TX for transmitting).
  • Ensure the target Bluetooth device is in pairing mode.
  • Move the devices closer to each other (within 10 meters).
  • Turn off and on both devices, then try pairing again.
  • Clear previous Bluetooth connections on both devices if possible.
• No audio output/input:
  • Check all audio cable connections (3.5mm AUX, RCA, USB).
  • Ensure the volume on both the K15-Pro and the connected audio device/source is turned up.
  • Verify that the correct audio input/output is selected on your external audio device (e.g., AUX input on a speaker).
• Poor audio quality or disconnections:
  • Reduce the distance between the K15-Pro and the paired device.
  • Remove any obstacles (walls, large metal objects) that might interfere with the Bluetooth signal.
  • Ensure there are no other strong wireless signals nearby causing interference.
• TF card not playing:
  • Ensure the TF card is inserted correctly.
  • Check if the music files are in a supported format (MP3/WAV/SBC).
  • Try a different TF card to rule out card issues.

Maintenance

• Keep the device dry. Avoid exposure to moisture or liquids.
• Do not attempt to disassemble or modify the device. This will void any potential warranty.
• Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
• Store the device in a cool, dry place away from direct sunlight and extreme temperatures.

Compliance and Certifications

The VAORLO K15-Pro Bluetooth Adapter complies with relevant safety and environmental standards.

• CE Certified: Conforms with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA).
• RoHS Compliant: Restricts the use of specific hazardous materials in electrical and electronic products.

Figure 14: RoHS Compliance Certificate

Figure 15: RED Compliance Certificate

Warranty and Support

The VAORLO K15-Pro Bluetooth Adapter comes with a manufacturer's warranty. For detailed warranty information, technical support, or service inquiries, please refer to the product packaging or contact the seller directly. Keep your purchase receipt as proof of purchase.

Product Demonstration Video