Support TF card and FM radio Works with or without Bluetooth capability Easy to controls your headphones Adjustable headband Foldable portable design Standby time: 120 hours Use time: 4 hours Battery: 250mAh rechargeable lithium battery Function: to adjust the volume, switch songs, answer incoming calls, reject a call, hang up the phone, Bluetooth play, hands-free calls, telephone replay, Bluetooth back even, voice prompts, power display, FM, TF, EQ