Bluetooth 50 Decoder Board Dual Channel Stereo Low Noise High and Low Tone Pre-Module Amplifier Board ZK-PT1 _x000D_ Product name: Bluetooth tone pre-module_x000D_ Product model: -PT1_x000D_ Bluetooth version: 5.0 (unobstructed, 10 meters)_x000D_ Signal to noise ratio: 90dB Input : 3.5mm audio input + Bluetooth input_x000D_ Output mode: AUX output (connect to active speakers and headphones)_x000D_ Number of channels: left and right dual channels (stereo)_x000D_ Adapter power supply: DC5-24V/1A or more_x000D_ colour:Black_x000D_ Material:plastic_x000D_ size:67 x 68 x 21mm Package Contents:_x000D_ 1 x Bluetooth tone pre-module Only the above package content, other products are not included._x000D_ Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_