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 & Song Selection Wirelessly via Connected Device – 2 Telephone Modes: Handset & Speaker – IP-47 Waterproof & 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” (W) x 6.0” (H) x 1.5” (D)