Plantronics M155 - Manual (Page 7)

SPECIFICATIONS
Talk Time Up to 5 hours
Standby Time Up to 9 days
Operating Distance (Range) Up to 33 feet (10 meters), Class II
Headset Weight 7 grams
Charge Connector Micro USB charging
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 Hands-Free (HFP) Profile 1.6 and Headset (HSP) Profile 1.2
Advanced Audio Distribution Profile (A2DP)
Operating Temperature 32°F - 104°F (0 - 40°C)
Storage Temperature 32°F - 104°F (0 - 40°C)
Charging Temperature 32°F - 104°F (0 - 40°C)