SMK-Link Rechargeable Bluetooth Notebook Mouse (VP6155) Provides up to 33-ft / 10-meter of reliable and secure data transmission Designed to work with Bluetooth enabled Mac and PC systems, eliminating the need for a separate receiver dongle Once connection is established, the mouse stays connected with the system without the need to reset Multiple RF channels eliminates potential interference The design eliminates the need to replace disposable batteries, rechargeable via the included mini USB charging cable and is operational while being charged Advanced Blue-optical sensor provides precision and accuracy in cursor control and enables tracking a wide variety of surfaces without the need for a mouse pad Fast tracking reduces mousing movement, prevents hand fatigue and provides improved productivity Mouse is designed with transportability in mind whether for long business trips or just moving between office, conference room and home Battery Type : 2 Ni-MH AAA batteries