Features: 1. Wireless to wired, plug 3.5mm audio cable directly connected to the headset without electricity (Prepare audio cable by yourself). 2. Can play with card, without Bluetooth connection, you can also play music with card. 3. Built-in microphone, convenient to chat. 4. Multi-dimensional folding, more convenient to carry.Specification: Wearing Method: Over-Ear Functional Use: Wireless Headset, Voice Headset Bluetooth Version: V5.0 Frequency: 2.402-2.480GHz, 2.4GISM Frequency Band Receiving Sensitivity: -84dBm Transmit power: up to 4dBm Frequency Response: 20Hz-20KHz Signal To Noise Ratio (SNR): 70dB Total Harmonic Distortion: (THD) 0.1% Headphone Charging: Rechargeable 400mAh Lithium Battery Type: (A)Japanese Voice Prompt