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

[Accessories included]
The FDX is rest assured with abundant accessories: 
--1 FiiO 14th Anniversary 24K Gold Plated Nameplate
--A high-purity gold-silver-copper hybrid braided cable with 2.5/3.5/4.4mm interchangeable plugs.
--5 sets of ear tips ( 3 Spinfit pairs, 3 balanced pairs, 3 bass pairs, 3 vocal pairs, 2 memory foam pairs, 2 tri-flange pairs)
--1 FDX Exclusive Wooden Case and 1 cleaning brush. 
--An MMCX clip which can help to detach the MMCX connector easily.

--1 interchangeable sound tube
--1 Magnetic wireholder
--1 storage case HB5

[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. Tri-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.

The cable of the FDX is detachable with a standard MMCX connector. (Compatible with FiiO's cable series with a detachable MMCX connector, including the LC-2.5/3.5/4.4B, LC-2.5/3.5/4.4C, LC-2.5/3.5/4.4D, LC-RE, LC-BT1, LC-BT2, UTWS1, UTWS3 and IRC-MMCX.)