eature: 1. Latest Bluetooth 4.0 technology. 2. Supports pairing two smarts devices at once. 3. MIC mute function. 4. Supports all compatible Bluetooth enabled device. 5. Built-in microphone. 6. Echo & noise canceling function for clear conversations. 7. Fast NFC pairing with NFC enabled smartphones. Specification: Bluetooth Version 4.0 Frequency response 20-20 000 hz Bluetooth frequency 2402 MHZ ~ 2480 MHZ Bluetooth profiles supported HFP, HSP, A2DP & AVRCP Bluetooth range up to 30 feet The distortion degree < 0.5% Charging Input DC 12V-24V Charging Output DC 5V/2.1A (MAX) Product dimension 1.7*0.4inch 3.5MM AUX Cable 150CM, 59inch Package Included: 1 X Bluetooth Car Kit 1 X Dual USB (Universal Serial Bus) 2.1A Car Charger 1 X User Manual