Elecom has a stylus pen that can connect to smartphones, tablets or other devices through Bluetooth and they can quickly change to a phone receiver when these devices receive a phone call. Elecom calls it a Bluetooth headset (LBT-PHS02MPSV).
At first glance, the device looks like an expensive-looking pen but there is a speaker, microphone, answer/hang-up button, and volume control button on it if you look closer. It also vibrates so that you will not miss phone calls when you are carrying it in your pocket.
It can also be used as a wireless remote control to call for Siri.
By connecting the micro USB to the accompanying charging cable or a smartphone charging cable that is compatible with this pen, you can recharge it.
Estimated Price: Open
Size: 12 x 13.5 x 145mm
Continuous talk time: 4.5 hours
Standby time: 90 hours