The Dynavoice Challenger CA802BT belongs to the family of solid-state stereo power amplifiers. The power amplifier is a device that receives the signal from the respective source (cd/dvd player, turntable, radio, etc.), after it has first passed through a preamplifier. It then appropriately amplifies it and transfers it to the speakers for playback. For this reason, power amplifiers usually only have the on/off button. In this case, it operates with transistors or otherwise solid state. Its power is 80W/4Ω or 160W/8Ω. It has a subwoofer output. It is also equipped with Bluetooth, a feature that allows you to connect wirelessly via your mobile phone or computer and enjoy your favorite music in better quality and higher volume.