#1: Monoaural ultra-light Unified Communications headset with enhanced DECT technology with triple wireless density for connecting to a desk phone, PC/notebook (soft phone)#2: DECT security class: C#3: With a Busylight integrated into the headset to show whenthe user is telephoning.#4: Enhanced (directional) noise-cancelling microphone filters background noise#5: Talk time: up to 13 hours#6; Standby time: up to 52 hours#7: Charging time: up to 90 minutes#8: DECT range up to 150 m#9: Mono headset weight: 57 g#10: Replaceable battery#11: Includes: headset, base station, AC adapter, USB connection cable#12: Microsoft-certified