Product description    The HM-5100 is an all-in-one solution for answering calls， chat and write with one device. Capture a screen shot， make a quick memo， practice your drawing skills or use any of the other functionalities of the S-Pen. But what is best about the HM-5100 is the ability to talk through it thanks to the speakers and highly sound sensitive microphones that are built-in! ※ S pen is compatible with mobile devices which have a Wacom Sensor.  The Samsung HM-5100 bluetooth S-Pen comes with noise reduction / echo cancellation (NR / EC) that filter out the noise around you， delivering a cleaner and clearer voice quality even in noisy environments.