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TF / Micro SD card with the loaded MP3 music and listen to the song directly on the headset. Designed with Bluetooth 5.0 chipset for lower power consumption and higher compatibility. Built-in microphone: Supports hands-free calling and voice . With the latest enhancements, your voice sounds clearer in a noisy environment. 40mm diaphragm speaker driver, deep sound quality stereo, enjoy wireless high quality music. Soft leather ear pads and a retractable headband reduce the burden on your ears. Do not feel uncomfortable,when wearing for a long time. Ergonomic design that simulates soft earmuffs based on human skin texture to ensure lasting comfort. Model: H2 with USB adaptor Uses: wireless headphones, voice headsets. Bluetooth version: V5.0. Bluetooth mode support: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5. Frequency: 2.402-2.480GHZ, 2.4G ISM band. RF performance: receiver sensitivity: -84dBm; transmit power up to 4dBm. Frequency response: 20 Hz-20 KHz. Signal to noise ratio SNR: 70Db. Total harmonic distortion rate THD 0.1%. Power indicator: Red and blue indicators flash alternately. Headphone charging: rechargeable 650MAH lithium battery. Charging port: USB charging interface. Normal charging time: 1-2 hours. Talk time: up to 20 hours. Standby time: up to 15 days. Working temperature: -20 ° C -55 ° C. Other features: support status indicator, charging indicator display. Color: red, black,white,Blue with bluetooth adaptor for watch T Package list: 1 * wireless earphone 1 * USB charge cable 2 * 3.5mm audio cable 1 * User Manual 1 * Bluetooth adaptor