Features: Upgraded BLE5.0 version! downward compatibility 4.2 4.1 4.0. Support automatic back-connection function, WAV+APE+FLAC+MP3 lossless decoding, stereo-output. Decoder board is small in size, simple in structure, and easy to use and install. Standard 3.5mm interfaces, output stereo-sound source, can be plugged into headphones, connect power amplifier and other devices. With LED indicators light, more convenient to use, the blue light stay on when in bluetooth-compatible modes. Applicable for various DIY, vehicles audio modification, home audio modification, personnel bluetooth-compatible audio, electronic project production, etc. Specifications: Material: Printed Circuit Board Interfaces Type: Micro-, Type-C(optional) Size: Approx. 3x3cm/1.2x1.2inch Bluetooth-compatible Version: V5.0 Power Supply: 3.7-5V SNR: 90dB THD+N: -70dB Crosstalk: -86dB DNR: 91dB Support Profile: A2DP/AVCTP/AVDTP/AVRCP/HFP LOS: more than 15m/49ft Package Includes: 1x Decoding Board note: Please allow 0-1cm error due to manual measurement. Please allow for slight color difference due to different display resolution.