Ten One Design Pogo Connect 2 Smart Pen for iPad (T1-PGCT-302) It's amazingly sensitive, with 0 grams of activation force. Low Energy Bluetooth 4.0 . It works at all angles. It requires no calibration. It provides hundreds of levels of pressure. Best of all? No moving parts, making it incredibly reliable. Location beacon to help keep track of your stylus. Months of continuous use on one battery.