Roman is our own brand, we are committed to providing masses of users with high quality Audio Bluetooth 2-in-1 Transmitter/ Receiver. The 2 in 1 Transmitter/ Receiver have portable size and fashionable appearance and fine craft. SPECIFICATION Bluetooth Version: 4.1 Supported Profile: A2DP Operation Range: Up to 33 feet Music Time: about 25 hours Charging Time: 2 hours Standby time: 400 hours Multi-Point Connection: Not supported Package contents: Multipurpose Bluetooth Receiver* 1 USB Charging cable*1 Quick Start Guide*1 Features Stream audio to Bluetooth-enable all 3.5mm media devices (enable Bluetooth receiving: speakers, headphones and more; enable Bluetooth transmission for: MP3, CD / DVD players, e-readers, TVs and more) Bluetooth 4.1 with Advanced Audio Distribution Profile for high quality audio sound Built in battery for portable use, or fast-charging it through the USB cable Portable size. One-button switch to shift between transmitter(TX) and receiver(RX) mode Box may show wear, product is new and in great condition