Arrela BM050 Bluetooth V4.0 Speaker Portable Wireless Stereo Audio Player Touch-Sensitive Control Support TF Card Reader, USB Card Reader and AUX Cable Applicable to Various Bluetooth Devices Ultra-portable, fits easily in a bag or backpack. Bluetooth 4.0 version, premium Bluetooth chip, HI-FI output, provide you perfect stereo music. Multiple function: play stereo music, FM radio, hands-free phone call, voice prompts, echo cancellation and noise reduction. Advanced cvc6.0 technology is adopted for noise reduction. 10m wireless range, 500mAh battery, provides long term use.