What's in the box:

Ground Loop Noise Isolator Eliminating Audio Noise Effectively for Car Audio System Home Speaker with 3.5mm Audio Cable (Standard)

Features:
ELIMINATING NOISE:
Completely eliminating the buzzing noise caused by ground loops which happens when the audio source and the speaker use the power source.
WORKING PRINCIPLE:
The working principle of it is to achieve a clear speech / music by eliminating the current noise in some car speakers / home stereo systems.
COMPATIBLE MODELS:
Works with any portable device that has 3.5mm audio jacks, suitable for Car Audio System / Home Stereo. Also used with a BT Receiver in car audio system.
COMPACT & PORTABLE:
Being so mini and light-weight (2.01*0.59*0.59 IN, 0.99 OZ), this little gadget does not take much space and can be easily taken away.
ENJOY CRYSTAL SOUND:
The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise. You will enjoy good quality sound when use it.

Specifications:
Color: Black
Frequency Response: 20Hz-20kHz
Jack: 3.5mm
Package Size: 7.5*4*2cm / 2.95*1.57*0.79in
Package Weight: 36g / 1.27oz

Connection Instructions:
Connect GROUND LOOP NOISE ISOLATOR between speaker and BT receiver with dual 3.5mm audio cable or 3.5mm to R C A audio cable as the following Picture shows.

Note: It can use from both sides, no direction limited, just plug one jack as input, the other is output.

Package List:
1 * Noise Isolator
1 * 3.5mm Audio Cable