3034 uses QCC3034 Bluetooth solution, version 5.0. Support: AAC//A2DP//-LL/-HD protocol,The product is suitable for converting audio amplifiers, DIY amplifier boards, preamp effects, etc. Traditional cable transmission becomes Bluetooth wireless transmission. The module uses the high-fidelity CSR64215 Bluetooth chip. High-speed Bluetooth 5.0 transmission ensures that the audio data is transmitted to the analog amplifier without loss. In order to achieve wireless HIFI level sound quality. The module supports APT-X lossless reception and the sound quality level reaches CD level. Is it really a lossy receiver module with Bluetooth? This module is a Bluetooth receiver that outputs a single-ended standard analog audio signal. The audio signal can be supplied directly to the front or rear stage analog amplifier without additional decoder. To facilitate the DIY friends conversion needs. The module supports auxiliary input to facilitate external linear audio. Between AUX and Bluetooth, high-precision relays are used to switch. The auxiliary input is switched directly by the relay without any chip processing. Ensures lossless output of auxiliary audio to the amplifier. Colour:Photo Color Material:Metal Package Contents: 1 x Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.