Amplifier power 18 Watt.
Headset wireless UHF connectivity to the amplifier.
Amplifier connectable also to Bluetooth devices like smartphones, tablets, computers.
Amplifier has a slot for SD-memory card, to play pre-recorded music or other voice during speech.
Can be purchased with wired microphone, which can be used to record speech to the SD-card
A really good product review can be found from The Clarinet project