Enjoy faster and more stable connections with the latest Bluetooth 5.3 technology. Features: 2 in 1 Bluetooth Transmitter & Receiver: As a Bluetooth audio transmitter: The C28 is specially designed for audio devices (MP3, MP4, TV, PC, etc.). Connect the Bluetooth transmitter to audio devices without Bluetooth functionality via the included 3.5 mm audio plug, turning these audio devices into Bluetooth-enabled audio devices, allowing them to work with Bluetooth-enabled headsets and speakers. As a Bluetooth audio receiver: The C28 is specially designed for car stereo systems and home audio systems. It can transform traditional car stereo systems and home audio systems into Bluetooth-enabled ones, easily pairing with Bluetooth-enabled smartphones, laptops, tablets, etc. With this product, you can enjoy music from your phone, laptop, or tablet without the hassle of cables. Specifications: Model Number: C28 Bluetooth: v5.3 Transmission Distance: 10m / 33ft Battery: Built-in rechargeable lithium polymer battery Working Time: 4-6 hours (depending on volume) Charging: Micro USB 5V/0.5A Audio Port: 3.5mm Color: Black Main Item Size: 2.2 * 5.95 * 1.2cm Package Contents: 1x C28 2in1 Bluetooth Audio Transmitter Receiver 1x 3.5MM Audio Metal Converter Head 1x Charging Cable 1x User Manual (with a simple self-made manual) Note: This product is a Bluetooth audio transmitter receiver. It can only be used for audio transmission and cannot be used for keyboards, mice, or file transfers.