Bluetooth Receiver Adapter, Aluminum Wireless Mini Bluetooth 4.1 Receiver with Amplifier & AUX Audio Adapter and Bass Boost Option for Headphone, Car Audio, Speaker, Home Stereo, PC, Earbuds (Black). This music receiver can be used with almost any audio receiver with an audio input jack, including automobiles. Hands-free music receiver is designed to receive music from mobile phones or transmitters that feature Bluetooth wireless technology. With one button away, easily switch between music and phone. FEATURES: Using the latest Bluetooth Chipset V4.1 Provides High Sensitivity Microphone to Ensure Quality Calling. Noising Cancelling Chip Integrated. Innovative Bullet Design. Wide Application Range Such as Car, Speakers , Headphones and So On. Bluetooth Version: V4.1 Charging Voltage: DC 5V. Charging Time: up to 1.5 Hours Working Time: 5 Hours. Connection Range: 10M/30ft Headphone Jack: 3.5MM easy to use bluetooth NOTE 1. If you can not turn on the product for the first time, maybe the battery is low, please try again after the device is fully charged. 2. Do not put the receiver in high temperature that is above 45℃ or exposed to sunshine, as it will influence service life. 3. It may result in damage to the receiver if the input voltage is too high, please follow the instructions. GREAT ON THE GO Lightweight, compact and makes for a great addition to both automotive and home stereo systems. Weight: 0.55oz SIMPLE DESIGN Equipped with the Reliable Bluetooth 4.1 for Faster and More Stable Connectivity, this Bluetooth Car Adapter Supports A2DP, AVRCP, HSP, and HFP. Built-in microphone allowing you to make outbound calls or record voice messages. Wide Compatibility Converting your standard 3.5mm speaker system to a wireless sound system powerhouse.