RN-52 - Bluetooth Audio Module - WRL-11678 - SparkFun Electronics
Microchip Roving Networks RN52-I/RM Bluetooth Version 3.0 Audio Module, Fully Compatible with Bluetooth Version 2.1+EDR, 1.2, and 1.1 : Amazon.sg: Electronics
RN52 BLUETOOTH AUDIO EVALUATION BOARD | Microchip Technology
GitHub - doayee/RN52-esp: An ESP compatible Arduino library for interacting with an RN52 Bluetooth Audio Chip with LCD metadata display example.