Specification:Using a single power supply、 such as USB 5V、 12V、 30V car workPower supply votage: DC 3.7-30VSize: 93mm* 55mm*25mmImpedance:47KOP-AMP£ºNE5532PNote:This is DIY Kit、 you need to solder it by yourself!Package included:1pcs DIY Kit For DA47