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 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 / 800 mah - Battery Charging Time: 1.5 Hours - Continuous Standby Time: 180 Hours * Built-in Rechargeable Battery - Speaker Impedance: 4-Ohm / 2 Watt - Attach or Hang Using the Retractable Hook - Dimensions: 2.55"" (W) x 6.0"" (H) x 1.5"" (D)