1 boot delay function (boot delay 3 seconds on the headset, shock proof)

2 the output DC offset protection (the output DC voltage above 0.7V are detected immediately start protection, protect the earphone is not burnt)

Cut off the headphones immediately after shutdown (3 off make, prevent off noise, shock headset)

4 protection board is made of high quality blue resistance PCB original Panasonic relay, Ningbo sound 6.35MM metal export headphone socket, have a fever components

Note: DIY kit only,you need to weld the components and board by yourself(schematics will be attached), the pictures above are finished board for your refference. DIY kit installation requires some basic electronic production and practical ability, there is the risk of damage during installing. Once the parts are installed we are not responsible for the components. Thank you for your understanding.