The Bluetooth Receiver is specially designed for Car Stereo systems and Home Audio System. And， it can change the traditional Car Stereo systems and Home Audio System into Bluetooth-enabled ones， and easy to pair with Bluetooth-enabled Smart Phones， laptop， tablet，etc. With this product， you can greatly enjoy music from your phone， laptop & MP3 without the hassle of cables. It is perfectly suitable for the car owners. Features:Magical Function: The Bluetooth Receiver Change the traditional Speakers into Bluetooth-enabled ones. After paired， play music wirelessly from your Bluetooth-enabled Smart Phones， Laptop， Tablet， etc. Support Automatic Re-connection. Great Hardware: Bluetooth 4.1 + EDR ensure stable signal， super-fast data transmission and high-fidelity stereo sound. Compatible with Most Speakers: Connect the Bluetooth Receiver with any Audio Input Devices， Stereo System (Car Stereo Systems， Home Audio System) & Speaker through standard RCA or 3.5 mm jack. Integrated Multi-point Technology: Can simultaneously connect two smarts phone. Also Support Voice Prompt.Embedded 48MIPS Dual MAC DSP co-processor. Support Noise Suppression and Echo Cancellation， offering you Magnificent Stereo Sound & Wonderful Sound Quality. Compatible with Lossless Audio Format; Support Stereo Codec; Support AUX Output. Superior wireless performance; Transmit up to 30 feet away with line of sight.Perfectly Compatibility: For iOS / Android Smart Phones， PAD and other Bluetooth-enabled Devices.Specifications:Model Number: B2Bluetooth Version: Bluetooth 4.1 + EDR， Class 2. Support Bluetooth Protocols: AVRCP， A2DP 1.3， HFP， HFP1.6， HSP1.2， SPPV1.2. Bluetooth Operating Distance: > 10mOutput Connection Way: 3.5mm Stereo Interface. Working Current: ≤ 20mA Standby Current: ≤ 20uA Built-in Battery: 300mAhCharging Current: 250mAhWorking Time: 8 ~ 10 hoursStandby Time: 15 hours Charge Time: 3 hoursCharge Port: Micro USB 5V / 0.5AColor: BlackItem Size: 11.0 * 6.0 * 1.5cm / 2.17 * 0.98 * 0.39inItem Weight: 12g / 0.43ozPackage size: 14.0 * 11.5 * 3.0cm / 4.33 * 2.95 * 0.79inPackage weight: 41g / 1.47ozPackage List:1 * Bluetooth Receiver1 * 3.5mm Connection Cable1 * 3.5mm to RCA Audio Cable1 * USB Cable 1 * English User Manual