1) 10m (33') working distance 2) Easy scrolling under windows XP /98, Me, NT 4.0, 2000 3) Resolution: 800dpi 4) With 2 AAA batteries 5) Compliance with Bluetooth Specification Version 1.2 6) 0dBm Class 2 or Class 1 output power 7) Sensitivity: better than-80dBm 8) Supports point-to-point 9) OS supports Windows XP and later 10) Supports 79 channels 11) Size: 8.8 x 4.6 x 3.3cm 12) Range of frequency: 2.4GHz ISM spectrum 13) Piconet: supports sever slave 14) Link modes: ACL and SCO 15) RF output power: 0dBm (1mW) class 2 16) Security: pairing, encryption, and authentication