2. What are the accessories? How to choose suitable ear tips? Is the cable interchangeable?

【Accessories included】
The FA7S is rest assured with abundant accessories: 
--A  8-stranded 152-core Litz silver-plated monocrystalline copper cable
--2.5/3.5/4.4mm interchangeable plugs.
--Abundant ear tips (3 balanced pairs, 3 bass pairs, 3 vocal pairs, 3 memory foam pairs, 2 daul-flange pairs)
--1 cleaning brush. 
--An MMCX clip which can help to detach the MMCX connector easily.
--1 Magnetic wireholder
--1 storage case HB1

【What are the differences between the ear tips?】
1. The Red and black ear tips: bass ear tips, which can improve the bass sense.
2. The translucent white ear tips: balanced ear tips, actual listening experience may vary from users.
3. The Red and white ear tips: vocals ear tips, more outstanding on mids performance with front vocals.
4. Daul-flange ear tips: design for the small sound tube which can make the sound deeper into the ear canal and get more rich sounds.
5. Memory foam ear tip: more fit for ear canals with better sound insulation and noise cancellation effects.
【How to choose suitable ear tips】
The outer diameter is 6.0mm, suit 4-5mm ear tips.

FA7S's cable can be change;
The ports is a standard expansion MMCX connector, (compatible with FiiO LC-B, LC-C, LC-D, LC-RE, LC-BT1, LC-BT2, UTWS1, UTWS3, UTWS5, IRC-MMCX cables)