Best Buy essentials™ Female 3.5 mm to Male 1/4" Audio Adapter Black BE-HCL311 - Best Buy
ANDTOBO 1/4'' to 3.5mm Stereo Pure Copper Headphone Adapter,3.5mm(1/8'') Plug Male to 6.35mm (1/4'') Jack Female Stereo Adapter for Headphone, Amp Adapte, Black 2-Pack - Walmart.com