Sony SRS-XB402M is a Bluetooth speaker equipped with dual passive radiators that work with two full-range 53mm satellite speaker units. Sony SRS XB402M wireless speaker has frequency response of 20 Hz to 20,000 Hz. It also supports Amazon’s digital assistant Alexa. One can ask the assistant to control device’s functions such as audio playback. You can also avail streaming services like Amazon Music, TuneIn, Kindle etc.