Feature: 1. Multifunctional Bluetooth Headset: With the function of Bluetooth headset, MP3, FM radio and computer headset, multiple modes switch at will, powerful. Bluetooth 5.4 supports stable connection up to 15 meters range, improves anti interference ability and stability and low power consumption, compatible with 99% of cell phones on the market. 2. Back Clip: MP3 Bluetooth headset with back clip can be clamped on the clothes to reduce the burden on the ear, not easy to lose very convenient and safe. Magnetic headphones are automatically adsorbed when they are close, magnetic adsorption technology can avoid headphone cable entanglement, easy to store. 3. Noise Cancellation: Voice Calls Intelligent noise canceling microphone to maintain high definition calls in different environments to eliminate 90% of the wind and noise, do not have to worry about the sound lag. CD quality powerful bass, listening to music more enjoyable, HIFI sound quality true reproduction of the ultimate sound effects. 4. Supports Memory Card: You can use the memory card after inserting it into the MP3 player, supports up to 64GB memory card (not included), enjoy the music you want. Support card reader function, connect to the computer to download the music you want. 5. High Capacity Battery: Built in 800mAh high capacity battery, long playing time, low power consumption, don't worry about the power problem. Portable and exquisite, easy to put in your pocket or bag. The digital display supports volume display, power display, memory display FM radio channels. Specification: Item Type: Multifunction Bluetooth Headset Material: ABS Bluetooth Version: 5.4 Receiving Distance: 10‑15 Meters Speaker Impedance: 32Ω ± 15% Speaker Sensitivity: 103±3dBat1KHz Frequency Response: 20Hz to 20KHz FM Radio Tuning Range: 76‑108MHZ Charging Voltage: 5V Battery Capacity: 800mAh Lithium Ion Battery (included) Memory Card: Support Up to 64GB Memory Card (not Included) Size: Approx. 70x40x25mm / 2.8x1.6x1.0in. Package List: 1 x Multifunction Bluetooth Headset1 x USB Charging Cable1 x Instruction Manual4 x Replacement Earplugs Note: All data are measured manually, and there are certain errors in the measurement results.