In receiver/receiver mode (RX), you can receive a Bluetooth audio signal and play it back on an audio amplifier, wired headphones or similar. Power can be supplied via the built-in battery or a USB-A port. The function as a transmitter or receiver can be set via the slide switch. The adapter is compatible with all older and modern Bluetooth audio devices. This is because it not only supports the standard Bluetooth codec, but also the high-quality formats aptX HD, aptX Low Latency, aptX and AAC. This not only results in better sound. The latency is also reduced. This is the name given to the time delay that occurs during processing and signal transmission. With aptX HD or aptX Low Latency, the transmission takes place almost in real time. This is especially important for musicians. When used with television, you thus get the sound synchronized with the picture, if your headphones also support one of these codecs. The ABT00101 is therefore ideal for connecting to a TV and then sends the sound to Bluetooth headphones. Thanks to Multipoint even to 2 headphones at the same time. The codec used is indicated by the flashing of the colored LED. When used as an audio receiver, for example, music from the smartphone is played on the hi-fi system or car radio (or allows conventional cable headphones wireless transmission). In the process, you can use the buttons to control the volume, skip tracks forward / backward or switch to pause. The built-in rechargeable battery provides about 20 hours of operating time (or 14 hours of running time with SPDIF connection). The USB micro jack is used to charge or permanently power the Bluetooth adapter. The ABT00101 supports Multipoint (2 headphones listen at the same time at the transmitter, not with aptX Low Latency) and Dual-Link (2 smartphones are paired at the receiver at the same time and used alternately).