Connection Type: Logitech Unifying protocol (2.4GHz) Special Keys: Mute, Volume Down, Volume Up Connect / Power: On/Off Switch Battery Details: 2 x AA Battery Life (not rechargeable): Up to 18 months Key life: Up to 5 million keystrokes Typing noise: Within 55 dBA for all keys Wireless range: 10 m (33 ft)
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