Features: NFC function makes connection easier and more convenient，no need to search for pairing. Makes wire sound systems become wireless Bluetooth stereo audio music speakers. Can be paired to any Bluetooth enabled devices， such as mobile phone， laptops， speaker. Standard RCA and 3.5 mm jack (3.5mm to 2-RCA cable included)， easily connected with the speaker input port. 5V USB output port can charge most USB-charged devices， include iPhone，iPad，iPod. Compact and human-friendly design， convenient to carry， suitable for home use and office， etc. Specification: Color: Black Size (Approx): 8.5��6.5��2.1cm/ 3.35�� 2.60 �� 0.83 inch Material: ABS Bluetooth Version:3.0 Bluetooth Distance: Up to 33 feet Input Port: Micro USB Output Port: USB Charging Voltage:5V Fit for: NFC or Bluetooth enabled audio device， support A2DP/AVRCP/HFP protocol Function: NFC， Microphone，Bluetooth Package include: 1 �� NFC Bluetooth Receiver1 �� Micro USB Charging Cable1 �� 3.5mm to 2-RCA Audio Cable1 �� User Manual