Rechargeable lithium batteries Precise sensor with 3-level adjustable resolution up to 2400 dpi Optional connection via Bluetooth or via 2.4 GHz radio - with AES-128 encryption Status LED indicates low battery, charging status and resolution Extra small nano receiver for radio operation Brand CHERRY Product Dimensions 9.9 x 6.25 x 3.35 cm; 92 Grams Batteries 1 Lithium Polymer batteries required. (included) Item model number JW-9100-2 Manufacturer Cherry Europe GmbH Series CHERRY MW 9100 Colour black Power Source Battery Powered Hardware Platform PC Operating System Linux Are Batteries Included Yes Lithium Battery Energy Content 550 Milliamp Hours (mAh) Lithium Battery Packaging Batteries contained in equipment Lithium Battery Weight 13 Grams Number Of Lithium Ion Cells 1 Item Weight 92 g