Because of the Phone system limits,you can only listen to music.
You cannot answer phone and adjust the volume.
 
2 in 1 Charging Audio Adapter For iPhone 7 7 Plus Lighting to 3.5MM Headphone Headset Jack Charger Earphone Cable
 
Can use to charge and listen to music Via the headphone at the same time.
Small and compact for portable usage.
Strong and durable.
Length:  About 20cm
Compatible with: iPhone 7 7 Plus 6 6S Plus 5S SE 5 etc