• The KIN Play Mini requires no additional amplification. Simply pair it with the world’s most popular sources and mobile devices and start enjoying your music.
• Connects to your devices instantly with Bluetooth
• AMP IN is a feature on KIN PLAY MINI that allows you to connect an external wifi streamer or audio source directly to the power amplifier, bypassing the internal preamp.

For more info from Totem : https://kinbytotem.com/products/kin-play-mini-bluetooth-amplified-bookshelf-speaker?srsltid=AfmBOopbcxoMEvTF9AWwokkMcnR9YfOHfBLXtJU7ZAcKgQtYlHk7Ipt2&variant=42327092560055