UGREEN Bluetooth Audio Receiver/Transmitter

Specifications

Note: Data measured by UGREEN lab; may vary based on specific circumstances.

Package Contents

• 1 × Bluetooth Audio Receiver/Transmitter
• 1 × USB-A to USB-C Cable
• 1 × 3.5mm Audio Cable
• 1 × 3.5mm to RCA Audio Cable
• 1 × 3.5mm Audio Adapter
• 1 × User Manual
• 1 × Quick Start Guide

Product Overview

The UGREEN CM667 is a versatile Bluetooth 5.2 audio adapter that can function as either a transmitter or a receiver.

Device Layout:

• Slide Switch: Located on the side, used to select between Transmitter (TX) and Receiver (RX) modes.
• Buttons:
  • Volume Up / Previous Track: Single-click for [Volume Up] (16-level adjustable). Press and hold for 1 second for [Previous Track].
  • Volume Down / Next Track: Single-click for [Volume Down] (includes mute function). Press and hold for 1 second for [Next Track].
  • Multi-Function Button (MFB):
    • Single-click: [Reconnect], [Play/Pause] Music, [Answer/End Call].
    • Double-click: [Force Pairing] mode.
    • Press and Hold for 3 seconds: [Power On/Off], [Reject Call].
    • Press and Hold for 10 seconds: [Clear Paired Devices List].
• Microphone: Integrated for calls.
• Ports:
  • 3.5mm Audio Port: For connecting audio cables.
  • USB-C Charging Port: For charging the device.

Indicator & Voice Prompts

(Voice prompts primarily function in RX mode)

Transmitter Mode (TX)

Wirelessly stream audio from your non-Bluetooth devices (e.g., TV, PC, Nintendo Switch, in-flight entertainment systems) to your Bluetooth earphones or speakers.

Connection Scenario:

Visual Description: Diagram shows various source devices like TVs, PCs, and Switch consoles connected via audio cables to the UGREEN CM667 device. The CM667 device is then shown wirelessly connecting to Bluetooth headphones, AirPods, or speakers.

1. Connect to 1st Bluetooth Earphones (e.g., AirPods):
   1. Slide the switch to "TX" mode. Press and hold the button for 3 seconds to [Power On] the product. It will automatically enter pairing mode, indicated by the indicator flashing red and blue alternately.
   2. Put your Bluetooth earphones into pairing mode (refer to the earphone's manual).
   3. The indicator on the UGREEN CM667 will turn solid blue for 3 seconds upon successful pairing.
   4. Connect the UGREEN CM667 to your audio source device (e.g., TV) using an audio cable.
2. Connect to 2nd Bluetooth Earphone (or speakers):
   1. Complete the pairing with the first set of headphones as described above.
   2. Put the second set of headphones or speakers into pairing mode according to their respective manuals.
   3. Double-click the button on the UGREEN CM667 to enter [Force Pairing] mode. The indicator will flash red and blue alternately.
   4. Pairing will be completed when the blue indicator turns solid blue for 3 seconds.

Receiver Mode (RX)

Wirelessly stream audio from your Bluetooth-enabled devices (e.g., phones, tablets, computers) to your non-Bluetooth stereo systems (e.g., amplifiers, car stereos, wired speakers).

Connection Scenario:

Visual Description: Diagram shows Bluetooth-enabled devices like phones and tablets wirelessly connecting to the UGREEN CM667 device. The CM667 device is then shown connected via audio cables to non-Bluetooth audio systems like speakers, car stereos, or amplifiers.

1. Connect to 1st Phone (e.g., iPhone):
   1. Slide the switch to "RX" mode. Press and hold the button for 3 seconds to [Power On] the product. It will automatically enter pairing mode, indicated by the indicator flashing red and blue alternately.
   2. On your phone, open the Bluetooth settings and connect to "UGREEN-CM667".
   3. The indicator will turn solid blue for 3 seconds, and your phone will show "connected" ✔️ upon successful pairing.
   4. Connect the UGREEN CM667 to your audio output device (e.g., speaker) using an audio cable.
2. Connect to 2nd Phone (or iPad):
   1. Complete the pairing with the first phone.
   2. Double-click the button on the UGREEN CM667 to enter [Force Pairing] mode. The indicator will flash red and blue alternately.
   3. Connect to "UGREEN-CM667" in your second phone's Bluetooth list.
   4. The indicator will turn solid blue for 3 seconds, and the phone will show "connected" ✔️ upon successful pairing.

Note: Music playback is supported from only one device at a time. To switch playback to another device, turn off the audio source on the first device.

Tips

• After initial pairing, the device will automatically reconnect to the last paired device.
• Double-clicking the button activates pairing mode. If two devices are already connected, disconnect one before pairing a new device.
• The product can store up to 5 paired devices. Connecting a 6th device will automatically clear the oldest entry in the memory list.
• If the device disconnects due to long distance, it will enter reconnecting mode. It will automatically turn off if reconnection is not established within 5 minutes.
• The product automatically turns on when connected to a power supply and cannot be shut down during charging.
• When the battery is low ?, the indicator flashes red once every 10 seconds. Please charge the device promptly.
• Charging indicators: Solid red for 3 seconds ⚡ upon starting charging, solid green for 3 seconds ✅ when fully charged.
• The product has built-in protection mechanisms that will automatically turn it off in the following situations:
  • Battery temperature is less than 0°C (32°F) or greater than 45°C (113°F) during charging ⚠️.
  • Battery temperature is less than -10°C (14°F) or greater than 60°C (140°F) when not charging ⚠️.

Clear Paired Devices List & Reset

1. Clear Paired Devices List

   After powering off the device, press and hold the button for 10 seconds. The indicator will flash red, green, and blue alternately to confirm that the pairing information has been cleared.

2. Resetting

   After powering on the device, press and hold the button. While holding the button, connect the product to a power supply using the USB-C cable. The product will automatically restart, completing the reset process.

Warning

• The product contains a built-in polymer lithium-ion battery. Do not dismantle, crush, squeeze, or expose it to fire.
• Stop using the product immediately if the battery is submerged in water.
• Stop using the product if the battery appears swollen.
• Do not expose the product to excessive temperatures.
• Keep the product out of reach of children.
• If the battery is accidentally swallowed or placed inside any part of the body, seek medical attention immediately.