Fangrui Product Details Description/features: 1. Bluetooth Connection Distance: After Testing, Different Mobile Phone Connection Distance Is Different. Usually The Bluetooth Connection Distance Of Mobile Phones Is 10 Meters. 2. When The Volume Is Turned Up, The Sound Is Stuck, Intermittent Or Stops. When The Volume Is Turned Down, The Playback Is Normal. 3.if There Is No Problem With The Power Supply, It May Be That The Horn Power Is Too Small, Our Power Amplifier Output Is 6w, You Connected Its A 2w Horn, The Volume Is Stuck, The Sound Will Be Stuck, There Is A Possibility That The Horn Burned. Specifications: Product Name; Bluetooth Audio Amplifier Board Product Model: Baa2 Chip Model: Mix3901 Bluetooth Version: Jl Bluetooth 5.0 Power Supply Voltage: 5v Dc Power Supply Current: 1-3a Output Channel: 2-channel Stereo Output Power: 6w +6w (4) Signal-to-noise Ratio: Due To Different Batches, There May Be Differences In Product Appearance And Printed Text, Which Will Not Affect Use Color:as Shown Material: Pcb+plastic+metal