Ugreen 3.5mm to 2RCA HiFi Stereo Y Split Adapter with Copper Shell up to 3 M

With its 24AWG gauge, this adapter is designed for use with virtually any cell phone, iPod, MP3 player, tablet or PC. Simply plug the 3.5mm jack into your device and connect the RCA connectors to your stereo receiver or amplifier and you're all set.

eBay