Bluetooth V2.1 Technology. Enjoy Hands-Free Calls with Built-in Microphone. Connect and Stream AudiO from MP3 Players, Smartphones, Tablets, PC, etc. Compatible with Other Bluetooth-Enabled Devices. Control Volume and Song Selection Wirelessly via Connected Device. 2 Telephone Modes: Handset and Speaker. IP-47 Waterproof and Dustproof Construction. Easy Operation with Touch Button Controls. Battery Life: 8 hours. 10 Meter Bluetooth Range. Includes USB Charging Cable. Battery Capacity: 3.7V / 800mAh. Battery Charging Time: 1.5 Hours. Continuous Standby Time: 180 Hours. Built-in Li-Polymer Rechargeable Battery. Speaker Impedance (Output): 4-Ohm / 2 Watt. Low Voltage Reminder Light. Glossy UV Surface Treatment. Attach or Hang Using the Retractable Hook. Dimensions: 2.55"Wx 6.0"Hx 1.5"D.