Only used a couple of times. Works great, a breeze to set up. Specs below. Bluetooth Audio Transmitter Bluetooth 4.2 Qualcomm aptX low latency Supported Profiles A2DP Supported codecs SBC, aptX, aptX LL (only supports aptX LL when only one headphone is connected, which is also equipped with apX Low Latency) Frequency Range: 20 - 20,000 Hz Number of channels: 79 Transmission frequency: 2402 to 2480 MHz Can be switched between two audio sources Bluetooth pairing button on transmitter Two-colour LED status indicator (blue and red) 3.5mm jack connection and optical input Weight: 85 g Includes 1.5m audio cable with 3.5mm jack, 1.5m optical cable, and 1.2m USB-A to USB Micro-B charging cable
eBay