Turn your car stereo/home stereo/3.5mm wired headphones into a wireless device Bluetooth V5.0 low power consumption, automatic connection Built-in microphone to answer hands-free calls It can connect two Bluetooth devices at once, use GPS navigation or answer phone calls DSP noise reduction technology, clear call quality Built-in 250mAh battery, use time up to 10 hours Specification: Bluetooth version: BT5.0 Material: ABS Battery capacity: 250mAh Input voltage 12-24 (V) Speaker resistance: 4 () Microphone sensitivity: -42DB+/-30DB Frequency Response: 2.402-2.480GHZ Working temperature: 0-50 Product net weight: 17g Product gross weight: 58g Product size: 4.3*4.3*1.2cm Package included: 1 x Bluetooth Audio Receiver 1 x Metal Connector 1 x Audio Cable 1 x Charging Cable 1 x English User Manual