Alesis Vortex Wireless

No. It is a 37-key MIDI keytar controller with velocity-sensitive keys and aftertouch, so it needs a computer, synthesizer, or sound module to produce audio. The original Vortex Wireless does not include a built-in speaker. [Alesis Vortex documentation](https://www.alesis.com/rscdn/937/documents/Vortex_Wireless_-_User_Guide_-_v1.1.pdf)

The original model uses an included USB wireless receiver rather than ordinary Bluetooth pairing. You insert four AA batteries, connect the receiver to a computer, and switch the keytar to battery mode. [Alesis Vortex Wireless user guide](https://www.alesis.com/rscdn/937/documents/Vortex_Wireless_-_User_Guide_-_v1.1.pdf)

Yes. It has a traditional five-pin MIDI output as well as USB MIDI, so it can control a compatible synthesizer or sound module. Battery power allows use away from a computer, although the sound still comes from the connected hardware. [Alesis Vortex specifications](https://www.alesis.com/products/view/vortex.html)

You need a computer running a DAW or virtual instrument, or an external MIDI sound module connected to an amplifier or headphones. The original package included Ableton Live Lite and SONiVOX Vortex-I software, but those downloads may not remain available with a used unit. [Alesis Vortex Wireless user guide](https://www.alesis.com/rscdn/937/documents/Vortex_Wireless_-_User_Guide_-_v1.1.pdf)