Musotoku - Mercury M-1 Wireless PenThis item can not be shipped via Air The Mercury Wireless Pen has been designed to work flawlessly with the ROVER R 1 Universal Battery, delivering 10 to 15 hours of continuous power. The Mercury is also compatible with magnetic batteries by Critical Bishop. For artists who prefer a corded connection, an RCA cap adapter is available to easily convert the pen for cord operated functionality. With fixed strokes of 4. 3, 3. 5, and 3. 0 mm, this machine