The device described in the manual is a Wireless FM Transmitter, model BH501, designed to be used in a car to play audio from various sources through the car's FM radio. It also features multiple charging ports for electronic devices.
Function Description:
The primary function of the BH501 is to transmit audio wirelessly to a car's FM radio. It supports Bluetooth connection for streaming audio from smart devices (phones, tablets, etc.) and also has an AUX Out port for wired audio connection to the car's AUX In port. Additionally, it can play audio from USB-A and USB-C storage devices. The device includes a built-in microphone for hands-free calling, allowing users to answer, hang up, reject, or redial calls. It also integrates a voice assistant function, enabling users to interact with their phone's voice assistant (e.g., Siri, Bixby, Google Assistant) through the device. The BH501 features an RGB ring light with multiple color options and dynamic modes for aesthetic customization. It also serves as a multi-port charger for various electronic devices, offering both USB-A and USB-C quick charge outputs.
Important Technical Specifications:
- Product Name: BH501
- Effective Distance: 5m (for Bluetooth connection)
- FM Tuning Range: 88.1MHz – 107.9MHz
- Support Audio Format: MP3/WMA/WAV/FLAC/AAC/APE
- Support Bluetooth Protocol: A2DP/AVRCP/HSP/HFP
- USB-A Quick Charge Output Port (QC3.0): DC 5V/3A, 9V/2A, 12V/1.5A
- USB-C Fast Charge Output Port (PD 20W): DC 5V/3A, 9V/2.22A, 12V/1.67A
- Light Colors: 7 single colors + 1 RGB static color + 1 RGB dynamic color (total 9 light modes)
- Microphones: 2 (Microphone 1 and Microphone 2)
- Other Ports: AUX Out Port
Usage Features:
Power On/Off:
To power on, insert the BH501 into the car's cigarette lighter. The screen will light up. If the device is in a power-off state while being electrified, a short press of any button will turn it on. To power off, cut the power to the device. If the BH501 is in a power-on state, a long press of the multifunctional button for 2 seconds will turn it off. Note that when the BH501 is turned off via the multifunctional button, its charging ports remain functional.
Light Adjustment:
The device offers 9 light colors: 7 single colors (Red, Green, Blue, Yellow, Cyan, Purple, White), 1 RGB static color, and 1 RGB dynamic color. A short press of the light button allows switching between these 10 modes. The device remembers the last light mode set when it reboots.
Bluetooth Connection:
- Enable Bluetooth on your smart device and search for "BH501" to connect.
- After successful connection, the device will automatically reconnect to the last-connected device upon subsequent use.
- After successful Bluetooth connection, users can appropriately turn up the volume of their device.
FM Tuning:
The device can output audio via FM Tuning or AUX Out.
- FM Tuning (if the car doesn't have an AUX port):
- Adjust the car's FM radio to a blank frequency (an empty frequency without any broadcast/A frequency only with white noise), e.g., FM 88.8.
- Long press the light button for 2 seconds to enter FM tuning mode. The LED display screen will flash.
- Rotate the ring knob clockwise to increase/decrease frequency and adjust it to the same as the car's FM.
- After tuning, short press the light button or wait for 3 seconds to exit FM tuning mode.
- There are two other ways to adjust the frequency:
- Precise Tuning: Short press the previous track button / next track button to increase/decrease frequency.
- Quick Tuning: Long press the previous track button / next track button to increase/decrease frequency.
AUX Out Connection:
If the car supports AUX input, connect the BH501 to the car's AUX In port using the included AUX cable for better audio experience. One end of the AUX cable connects to the BH501's AUX Out port, and the other end connects to the car's AUX In port.
Bluetooth Hands-free Function:
- Answer a call: Short press the multifunctional button.
- Hang up a call: Short press the multifunctional button.
- Redial last number: Double press the multifunctional button.
- Reject a call: Long press the multifunctional button for 2 seconds.
Music Function:
- Pause/Play: Short press the multifunctional button.
- Previous Track/Next Track: Short press the previous track button or next track button.
- Volume Up/Down: Rotate the ring knob clockwise/anticlockwise.
Voice Assistant:
- Enter voice assistant: Double press the previous track button.
- Exit voice assistant: Double press the previous track button.
For Android devices, users need to wake up the voice assistant, turn up the phone's and BH501's volume to their maximum level, and adjust the car speaker's volume.
For iPhone, the instructions for "Hey Siri" function are provided, including turning on Siri settings on the phone and completing voice recognition according to Siri instructions.
Charging Description:
- 7.1 USB-A QC3.0 Quick Charge: For smart devices that do not support quick charge, the default output is 5V/2.4A. For smart devices that support quick charge, the maximum charging voltage and current of USB QC3.0 are DC 5V/3A, 9V/2A, 12V/1.5A.
- 7.2 Type-C PD 20W Fast Charge: USB Type-C supports PD 20W fast charge. The maximum charging voltage and current are DC 5V/3A, 9V/2.22A, 12V/1.5A.
Maintenance Features:
General Notes:
- Do not turn up the radio's volume too loud in case of increasing background noise.
- Although the transmitting power of the FM transmitter is strong, for ensuring the best sound effect, try to avoid adjusting to the frequency of local radio stations with strong signals.
- Do not use the product in too hot/cold, dusty, or damp environments.
- Do not break or throw the product to prevent surface or unit damage.
- Do not disassemble the product personally. Contact the seller if you have any questions or problems.
Friendly Tips:
- For Android devices, when using the voice assistant, ensure to wake up the voice assistant, turn up the phone's and BH501's volume to their maximum volume level first, and adjust the car speaker's volume according to your needs.
- The "Hey Siri" function is not available for some phone brands. Supported phone brands are iPhone, Samsung phones, and original Android phones.
FCC Statement:
The device complies with part 15 of the FCC Rules. Operation is subject to two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body.
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