BT-12 Helmet Headset Review

My review of the $25 (AUD) BT-12 Motorbike Helmet Headset available on eBay. Overall a well priced unit with basic features.
Volume buttons also work to skip back and forth through songs, hold the button to adjust volume.
Siri will listen to commands through the headset microphone but will not respond to "Hey Siri" when riding, let me know if it works for anyone else? If your phone is mounted to your handle bars you could use the phone to summon Siri, however I keep my phone in my pocket so that doesn't work for me.