HQRP 9V Battery Snap Connector and USB Step-Up Module Converter for Digital Multimeter, Microphone, Toys Clip Connector Holder Cable Power Supply Cord + Coaster HQRP&reg; 9V Battery Holder with Step-Up Converter plus HQRP&reg; Coaster; Input: 5V USB; Output: DC 9V or 12V, 2000mA; Before use please read the instructions carefully and check the possibility of using the 9V Battery Holder with your device; 1 Year warranty!