Built-in 300mAh lithium battery, fully charged in about 45 minutes; receive mode works up to 6 hours, transmit mode works up to 3.5 hours. Stable and smooth 10-meter long-distance transmission in an interference-free environment. Soft red/blue light ring adds visibility without being blinding, enhancing nighttime usability. Equipped with high-performance Bluetooth chip for stable, low-latency connection and support for long-distance transmission. Connects to computers, Bluetooth headphones, stereo systems, and other Bluetooth devices; enables wireless audio streaming. Bluetooth version 5.3. Supports Bluetooth receiving and transmitting. Automatically connects to previously paired devices when powered on. Automatically shuts down after 3 minutes if no device is connected. Up to 6 hours of music playback on a full charge. Supports Bluetooth profiles: A2DP, AVCTP, AVDTP, AVRCP, HFP, SPP. Supports Bluetooth stereo music with DSP technology. Includes AUX audio input and output. Color: black Material: plastic and metal Package Contents: 1 x Bluetooth transmitter 1 x charging cable 1 x metal adapter Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight color variations between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.