Wireless on-ear Bluetooth headphones equipped with a 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 LED indicators showing device status or mode Power supply: 200mAh battery Bluetooth range: 10m Output power: 2*20mW Distortion coefficient: <=1% SNR: >=95dB Frequency range: 20Hz - 20kHz Supported TF cards: 128MB-32GB FM frequency: 87.5-108MHz Operating time (music playback): 4h Charging time: less than 2h Package includes minijack-minijack 3.5mm cable and USB-microUSB Number of pieces. in carton: 50