1Mii B06 Plus Bluetooth HiFi Receiver, Wireless Audio Adapter, aptX HD aptX Adaptive Bluetooth 5.3 Receiver with 3D Surround Works with Smartphones and Tablets for Stereo System Speaker. 164 feet long rangeWith Class 1 Bluetooth technology, the 1Mii Bluetooth receiver can achieve a range of up to 164 feet (50 m) line of sight outdoors and up to 50-70 feet (20-30 m) indoors (without obstacles).
eBay