Wireless on-ear Bluetooth headphones equipped with an MP3 player, microSD card reader, AUX input, microphone, and FM radio. Thanks to Bluetooth connectivity and a built-in microphone, the device can be used for making phone calls. Technical Specification: Bluetooth connection Built-in microphone MicroSD card slot AUX input - option to connect traditional headphones Colorful LED indicators showing device status or mode Power supply: 500mAh battery Frequency range: 20Hz-20kHz Bluetooth range: 10m Music playback time: 4h Charging time: less than 2h Adjustable headband Earphone diameter: 7.5cm Package includes USB-microUSB cable and miniJack-miniJack 3.5mm Number of pieces. in carton: 60