System: Android 4.1.2 Jelly Bean
Stock phone, not unlocked, not flashed.
As handsfree (more like both hands full:)) it works perfect. Good size, good grip. Pick up button (hang up) works perfect too. However, volume button does not work under any android i tested. No chance. Red light (led) does not work either. Anyway, it's very cool device, loud, signal is very clear and crisp. No cracking/rattling noise. If you install app like Degauss or Klick you can customize pick up button for any action like start of player or start of weather app. I would recommend it as very funny indeed, everyone will noticed. If phone is connected to 3,5mm jack - phone is ringing as normal (through phone speaker as normally) so you don't need to be afraid of missed call. Plastic looks solid without any sharp edges or visible flaws. Surface is matted not glossy and cord is long enough slightly tinier than normal one. This device is practical and often more comfortable when siting behind your desk than holding flat smart phone. Also works perfect on notepad (chinesse cheap device). Except volume button and red light it's superb.