Logitech M557 Bluetooth Mouse Quick charger Efficient Charging: Boasts an 80%

Efficient Charging: Boasts an 80% or higher energy conversion rate

*NOTE: ANC (Active Noise Cancelling) works best at reducing consistent Low-Frequency Background Noise

USB : USB 2

Built-in lithium battery: 300mAh

Contoured and portable shape

Logitech M557 Bluetooth Mouse Quick charger Efficient Charging: Boasts an 80%Logitech M557 Bluetooth Mouse KEY FEATURES WORKS WITH ALMOST ANY DEVICE Connect to any Bluetooth enabled PC or Mac or Windows 8 tabletno receiver required. GO FOR ONE FULL YEAR The M557 offers exceptional battery life for a Bluetooth mouse. ALL THE CONTROL YOU NEED Customizable buttons give you one touch access to the things you use most, like the Windows 8 Desktop and Start Screen. BLUETOOTHWIRELESS Connect to any Bluetooth enabled PC or Mac computer