Support Dual stream (TX mode): The transmitter supports the simultaneous connection of two Bluetooth speakers or headphones (using the same CODEC), and the dual connection can support up to aptX Adaptive.Codec method CODEC: aptX Adaptive/aptX HD/aptX LL/aptX/.Note for APTX use: aptX Adaptive CODEC is preferentially supported in single connection (the connected device must also support aptX Adaptive).2 indicator lights, the blue light flashes quickly, the first device is searched and paired; the blue light is always on, the Bluetooth device is successfully connected; the green light is flashing quickly, the second device is searched and paired; the green light is always on, the two Bluetooth devices are successfully connected.Bluetooth version: Bluetooth V5.3; Supported protocols: A2DP, AVRCP, , HFP, ; Working frequency band: 2.402GHz -2.480GHz; Power supply mode: DC5V; Input interface: USB (drive-free), AUX audio.Operation instructions:1. Turn on the Bluetooth headset and set it to pairing mode.2. Insert the device into the power adapter or the USB of the PC host, double-click the pairing button, the blue LED light flashes rapidly, and the device enters the pairing state.3. The blue indicator light on the device is always on, and the connection is successful. (After connecting one device, the blue indicator is always on. Double-click the button, the green indicator flashes quickly and automatically searches for and connects to the second device. After the second device is successfully connected, the green indicator is always on.)Material:plasticcolour:BlackPackage Contents:1 x Audio Transmitter Adapter1 x 3.5mm Audio Cable1 x English manualOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.