Jewel is a Bluetooth headset thought to be worn and shown as a precious jewel or necklace.
The device is composed by two pieces: the microphone and the earpiece.
Once there is an incoming call, the external part of the earpiece lights up and becomes green.
To accept the call or to start a conversation you just have to put the earpiece on the ear and push the green lightened button.
Now the green lightened button becomes red, and to end the call you just have to push it again.
Once the conversation is over you simply have to place the earpiece back in place in the microphone and the headset will looks again like a precious jewel.