A great feature is the M55's ability to pair and maintain connections with two phones and answer calls from either phone.
The DeepSleep power‐saving mode activates when your M55 is away from your phone for over 90 minutes. When it’s back in range (33 feet or less), you can just tap the call button to wake it up. Using the DeepSleep mode can extend battery readiness for up to five months.
Plantronics also has a downloadable app that can be used on many Android-powered mobile phones or tablets to help you find your headset. The app also can also display an on-screen headset battery meter on your mobile phone or tablets. See the specifications tab for a link to the app and compatible devices. There's also a manufacturer's two-year limited warranty.
Talk time: Up to 11 hours
Standby time: Up to 16 days
DeepSleep mode: Up to 150 days
Operating distance: (Range) Up to 33 feet (10 meters), Class II
Headset weight: 8 grams
Charge connector: Micro USB charging (USB lead and 12V car charger / adapter included!)
Battery type: Rechargeable non-replaceable lithium ion polymer
Charge Time (maximum) 2 hours for full
Power requirements: 5V DC – 180mA
Bluetooth version: Bluetooth v3.0
Bluetooth profiles: A2DP, Hands-Free (HFP) Profile 1.6 and Headset (HSP) Profile 1.2
Operating temperature: 0-40C (32F-104F)
Storage temperature: 0-40C (32F-104F)
Charging temperature: 0-40C (32F-104F)
What's in the Box?
12V Car Cigar / Power Outlet USB charging adapter (included)
USB to micro USB cable