RN52 Bluetooth Audio Module Datasheet by SparkFun Electronics | Digi-Key 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
RN-52 - Bluetooth Audio Module - WRL-11678 - SparkFun Electronics
Building an RN52 Bluetooth MetaData Display with Arduino - Doayee