Features 1、Promi optical computer pen mouse moves easily for precise optical tracking with or without a mouse pad, which can works perfectly on the bed. 2、A triple mode BT mouse with 3 way connections(USB+dual BT). You can connect either by USB or BT. 3、Built-in 450mAh lithium battery, long battery life, no need to change new batteries. 4、The mouse comes with 3 kinds of always-on lights, which are more brilliant to use. The internal structure of the mouse can be clearly seen through the lights. 5、Ultra small and compact design, you can easily fit it in your pocket or backpack, take it from home to office or go for a travel. Specification Specification: Product name: Pen mouse Color: Grey DPI: 800/1200/1600 Wireless transmit frequency: 2.4GHz BT version: V3.0/V5.0 Support system: for Win ALL for OS X for Android for Linux Operating distance: 10m Number of keys: 4 keys Connection to computer: wireless Working mode: Optoelectronics Interface: Type C Battery: 500mAh Item size:14*2.3*1.4 cm / 5.51*0.91*0.55 in(L * W * H) Item weight: Approx.25.2g /0.89oz Package size:16.6*9.2*3.4 cm / 6.54*3.62*1.34 in(L * W * H) Package weight:93g /3.28oz Package List 1 * Pen Mouse 1 * USB to Type C Adapter 1 * USB to Micro USB Adapter 1 * USB Receiver 1 * Charging Cable 1 * Carry Bag 1 * User Manual