Specifications: Brand: Remax Model: RB-725HB Wireless 5.0 for a stable connection. A free-folding design. Support TF card music playback. 40mm loudspeaker, enjoy your music feast. Comfortable to wear & easy to carry. Type: Card Wireless Bluetooth Headphone Input: DC 5V-200mA Rated Power: 30mW Driver Impedance: 32 ohm Driver Sensitivity: 98±3db Frequency Response: 20Hz~ 20kHz Bluetooth version: 5.0 Bluetooth distance: 10 meters Working voltage: 4.2V Battery specification (capacity): 200mAh Charging time: about 2 hours Talk time: 7 hours Standby time: about 60 hours Material: ABS Multiple Play Modes 1. A more user-friendly design of elastic rotatory headband, for more comfort and convenience. 2. A large battery capacity, durable and fast charging. 3. Support wireless version 5.0 and wireless fast connection. 4.40mm large speakers with clear and smooth sound quality, only to provide a music feast. 5. Compatible with card insertion for songs, enjoy music anytime anywhere.