Feature: 1. [Multi-functional Adapter] Receiver and transmitter 2-in-1, one-button switch, upgrade non-BT audio devices to BT-enabled ones. With built-in microphone, it enables hands-free calls to ensure driving safety. 2. [Receiver Mode] Change the traditional Car Stereo system or Home Audio System into BT-enabled ones, pair with your BT-enabled smartphone, laptop, tablet PC to enjoy wireless music. 3. [Transmitter Mode] Can be connected to the audio devices (such as MP3, TV, and PC, etc.) without BT function, changing them into BT-enabled ones, and to work with BT-enabled headset or speaker. 4. [BT5.0 Technology] Wireless 5.0 technology ensures transmitting strong signals in high-quality and high speed. BT range reaches up to 10 meters in open space. 5. [Low Power Consumption] Built-in 140mAh battery ensures up to 4 hours working time, you can enjoy wireless free all day long. Easy connection, plug and play. Specification: Overview: C28 is a 2 in 1 BT Transmitter & Receiver. As a BT Audio Transmitter, it can be connected to the audio devices without BT function, changing them into BT-enabled ones, and making it work with BT-enabled headset and speaker. As a BT Audio Receiver, it can change the traditional car stereo systems and home audio system into BT-enabled ones, and easy to pair with BT-enabled smartphones, laptops, tablets, etc. C28 will give you much fun and convenience. Features: [Multi-functional Adapter] Receiver and transmitter 2-in-1, one-button switch, upgrade non-BT audio devices to BT-enabled ones. With built-in microphone, it enables hands-free calls to ensure driving safety. [Receiver Mode] Change the traditional Car Stereo system or Home Audio System into BT-enabled ones, pair with your BT-enabled smartphone, laptop, tablet PC to enjoy wireless music. [Transmitter Mode] Can be connected to the audio devices (such as MP3, TV, and PC, etc.) without BT function, changing them into BT-enabled ones, and to work with BT-enabled headset or speaker. [BT5.0 Technology] Wireless 5.0 technology ensures transmitting strong signals in high-quality and high speed. BT range reaches up to 10 meters in open space. [Low Power Consumption] Built-in 140mAh battery ensures up to 4 hours working time, you can enjoy wireless free all day long. Easy connection, plug and play. Specifications: Model Number: C28 BT Version: 5.0 Transmission Distance: 10m / 33ft (space place) Battery: Built-in rechargeable Li-ion battery (140mAh) Working Time: about 4 hours (depends on audio volume) Charging: Micro USB 5V Color: Black Main Item Size: approx. 59.5*22*12mm/2.34*0.86*0.47in Main Item Weight: 10.5g/0.37oz Package Size: 102*67*18mm/4.01*2.63*0.70in Package Weight: 39g/1.37oz Package List: 1 * BT Transmitter & Receiver 1 * 3.5mm Audio Adapter 1 * USB Charging Cable 1 * User Manual (English/Chinese) Package List: 1 * BT Transmitter & Receiver 1 * 3.5mm Audio Adapter 1 * USB Charging Cable 1 * User Manual (English/Chinese)