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 "Bluetooth kit" is a versatile package of components designed to either add Bluetooth functionality to non-Bluetooth devices or serve as an all-in-one package for specific applications like DIY projects or car integration. These kits eliminate the need for complex wiring and enable wireless connectivity for audio streaming, hands-free calling, data transfer, and device control. 

Types of Bluetooth Kits

The type of kit varies greatly depending on its intended application:

Car Bluetooth Kits: These are designed for vehicles to enable hands-free calling and music streaming through the car's existing audio system. They typically include a microphone and connect via an AUX input or FM transmitter.

Kinivo Bluetooth Hands-Free Car Kit (BTC450)

: This kit allows for answering calls and streaming music with CD-quality audio (supports aptX) and includes a built-in microphone and car power adapter.

Portronics Auto 12 in-Car Bluetooth Receiver

: A compact adapter that connects via a 3.5mm AUX connector for music and hands-free calling, powered by a USB car charger.

Bluetooth Audio Transmitter/Receiver Kits: These highly versatile devices can act as a transmitter (adding Bluetooth to a non-Bluetooth TV) or a receiver (adding Bluetooth to a wired speaker).

UGREEN 2-in-1 Wireless Bluetooth Car Kit Multi-Functional Transmitter Receiver

: This portable device features dual functionality, allowing non-Bluetooth devices to transmit or receive audio signals with a simple switch, supporting Bluetooth 5.0 for a stable connection.

DIY Speaker Kits: For hobbyists, these kits contain all the necessary electronic components (amplifier board, speakers, battery, wiring) to build a custom Bluetooth speaker.

Electrobot DIY Portable Bluetooth Speaker Kit MDF Buildable Speaker Box

: This all-in-one kit includes laser-cut panels for a simple, no-soldering-required assembly into a functional speaker, making it an excellent STEM project.

Bluetooth Development/Sensor Kits: These are aimed at developers and engineers to integrate Bluetooth functionality into new products or IoT (Internet of Things) applications.

HC-05 TTL Bluetooth Transceiver Module

: A popular module for electronic projects that provides basic Bluetooth communication capabilities for connecting microcontrollers or other embedded systems.