Charging function: One USB-A port for smartphone charging User interface features: Touch sensitive user controls for - Call answer/end - Mute - Volume +/- - Programmable function button - Bluetooth pairing Push button user controls for - Power on/off - Wireless daisy chain Security: Kensington lock slot Connectivity: Wirelessly connect two Poly Sync 40 units together for larger meetings rooms (when connecting wirelessly to a PC or smartphone via Bluetooth) Audio features: - Three microphone steerable array - Full duplex audio - Noise and echo reduction - Speaker - Bass reflect with dual passive radiators Battery: Battery type: Li-ion Battery capacity: 5000 mAh Talk time: Up to 30 hours Charging time: 5 hours Dimensions: 38 x 102 x 273 mm Weight: 610 g Cable length: 1050 mm Please note: We recommend the Poly Plus Service for this product. The Plus Service includes the following: - Software upgrade and updates - Spare part service - Next business day - Poly Online Support Center access - Technical escalation support - 24 x 7 technical phone support - Priority technical support - Ecosystem Cloud Partner (ECPS) support - Network diagnosis tests, e-mail notifications - Discount on Professional Services - Poly Lens premium features - Enhance support calls with live video diagnosis Poly SYNC 40 1Y Plus Service (487P-SYNC40-112) Poly SYNC 40 3Y Plus Service (487P-SYNC40-312) The service can be extended.