Features: 2 in 1 Bluetooth Transmitter & Receiver. As a Bluetooth Audio Transmitter, it is designed for audio devices such as MP3, MP4, TV, and PC that do not have built-in Bluetooth functionality. Connect the transmitter to these devices using the included 3.5mm audio plug to enable wireless audio streaming to Bluetooth headsets and speakers. As a Bluetooth Audio Receiver, it is designed for car stereo systems and home audio systems, allowing them to receive audio from Bluetooth-enabled smartphones, laptops, and tablets. Easily pair with your Bluetooth devices and enjoy wireless music playback without cables. Model number: C28 Bluetooth: V5.0 Battery: Built-in rechargeable Li-polymer battery Working Time: 4 hours Audio Port: 3.5mm Color: Black Main Item Size: 2.2 x 5.9 x 1.2 cm / 0.86 x 2.32 x 0.47 in Package includes: 1 x Bluetooth Transmitter & Receiver