ADAPT go is a portable Bluetooth transmitter/receiver that allow you to turn any wired audio product to Bluetooth anable or trun any non-Bluetooth terminal to Bluetooth compatible. Compart size and easy to carry around. Pratical gadget during traveling to turn the entertainment system on plane/train to work with your nice wireless earbuds/headphone. Bluetooth version is V5.1, support up to 10 meters connection distance. With 300mAh rechargeable polymer li-on battery can last up to 8 hours after single charged. Charge input is 5V/200mA and will take approximately 2 hours to charge the stylus from 0% to 100%. Working frequency is 2.402GHz-2.480GHz. Delivered in our Tekiō premium kraft box with colorful sticker.