Bluetooth receiver/transmitter UGREEN CM403 — 3.5 mm jack, Bluetooth 5.0, 145 mAh battery, black

UGREEN CM403 is a compact Bluetooth receiver and transmitter with a 3.5 mm jack and Bluetooth 5.0 support. Housed in a PC casing, the device measures 92 × 19 × 11 mm and includes a 145 mAh battery. The CM403 adds wireless audio capability to wired headphones, speakers or car stereos and can also transmit audio from non-Bluetooth sources to Bluetooth headphones or speakers.

Advantages

The CM403 supports Bluetooth 5.0 for stable wireless connections and low power consumption. Its 3.5 mm host interface ensures compatibility with a wide range of audio equipment. The compact PC housing and lightweight dimensions make the device portable and easy to install in confined spaces.

Suitable for

• Adding Bluetooth to wired headphones or portable speakers
• Connecting smartphones or tablets to car stereos with a 3.5 mm aux input
• Transmitting audio from non-Bluetooth audio sources to Bluetooth headphones or speakers

Key specifications

• Host interface: 3.5 mm audio jack
• Wireless standard: Bluetooth 5.0
• Battery capacity: 145 mAh
• Housing material: PC (polycarbonate)
• Dimensions (H × W × D): 92 × 19 × 11 mm

How to use

Connect the CM403 to the 3.5 mm audio input or output of the target device, power on the unit and pair it with a Bluetooth source or sink according to the device pairing procedure. When used as a receiver, pair the CM403 with a Bluetooth audio source and plug the 3.5 mm jack into wired headphones or speakers. When used as a transmitter, connect the CM403 to the audio output of a non-Bluetooth device and pair with Bluetooth headphones or speakers. Observe on-device indicators for pairing and battery status.

Recommendations

For best performance, keep the CM403 within the typical Bluetooth range of connected devices, avoid strong radio interference, and recharge the battery before long use sessions. Use compatible 3.5 mm cables and ensure connectors are fully inserted for reliable audio transmission.