This is junk. It is unopened, so I haven't been able to confirm, but there is a possibility of battery leakage. There are white marks. Please purchase assuming potential leakage. Logicool m545 wireless mouse with up to 18 months of battery life. - Brand: Logicool - Model Name: m545 - Connectivity: Wireless - USB Receiver: Yes - Battery Life: Up to 18 months - Features: Unifying compatible Thank you for viewing.