Elegant bluetooth headphones with quality sound. The headphones have an FM tuner for listening to the radio, AUX audio input with a 3.5mm jack, a microSD card slot of up to 32GB, a handsfree microphone and swivel headphones for more comfortable music listening. Packed in Swissten blister.Bluetooth version: V4.2Compatible bluetooh profiles: A2DP, AVRCPSupported formats: MP3 8-320Kbps, WMA 5-320Kbps, WAV 16-1536KbpsRadio frequency range: 87.5-108MhzHeadphone diameter: 40mmImpedance: 32ohmSensitivity: 108 +/- 3dBFrequency range: 20-20000HzRange: 10mCharging time: 2hOperating time: 6-8h