MOSTOP Guitar Interface Adapter for iPhone / iPad / iPod iOS Devices Connect Electric Guitar and Bass with 1/4" Female Mono Input Jack Connector 1/8" Female Stereo Output Mini-jack Connector | Pricepulse
Plug Your Guitar into your iPhone and iPad with this DIY iRig | Cult of Mac
iRig HD 2 lets you connect guitar, 3.5mm headphone to Apple's iPhone via Lightning | AppleInsider
Buy CAMOLA Guitar Headphone Amp Mini Plug Guitar Headphone Amplifier Rechargeable Pocket Guitar Amp with Bluetooth Receiver Clean Chorus Flanger Metal and Wah 5 Effects for Electric Guitar Online in Hungary. B08MSXVF1R
Video - How to plug your guitar into iPad - Apogee Electronics
Sescom TRRS to 1/4" Jack Guitar Level and 3.5mm IPHONE-ML14-1RA