Bluetooth Speakers, SmartSpeed 4.0 Portable Wireless Speaker with Screen Touch, NFC, Bass and Microphone Special and novel outlook design is just for user firendly. With screen touch and NFC, you can easily control the speaker. Stable and excellent Bluetooth 4.0 chip. Compatible with most Bluetooth device and 3.5mm audio device. High definition and surround stereo sound, just enjoy impressively crystal clear sound quality and robust bass music Built-in 800mA rechargeable and removable battery for up to 6 hours of playtime. Built-in microphone for hands-free speaker phone calling. Compact size as a fist,4*3*2.5 inch,easily to carry with, only 8.57 ounces.