B01CKGTT6C Xkey AIR 37-Key Bluetooth MIDI Controller (Silver)

4.0 Bluetooth, low-latency connection capabilities + USB connection
Ultra slim molded aluminum body housing is less than 1″ thick, weighing just over 2 lbs.
Polyphonic Aftertouch: Velocity controlled keys, with the ability to adjust settings such as sensitivity, velocity and timing
Extremely durable and portable. Fits in any bag or case