Question 1

Does this work on all sega genesis models i have the model 1 with the volume switch

Accepted Answer

This controller will work on all models, however for certain titles, you will have to switch to the 3-button layout via the mode toggle function (by holding the minus/select button for 3 seconds).

Question 2

Will this controller be able to wirelessly connect to the 8bitdo wireless adapter usb for pc/switch?

Accepted Answer

I used mine on my PC and it must be connected with a USB mini. I don't have a Switch so I can't speak of that. The PC identifies it as a XBOX 360 controller. 
The buttons for PC are as follows:
A = 1   X = 3
B = 2   Y = 4
C = 6   Z = 5
DASH = 7
START = 8 
L & R = Z AXIS
HOME=MIDDLE BUTTON for XBOX 360
STAR=RAPID FIRE

Question 3

Any benefit to this version over the bluetooth version?

Accepted Answer

It has the advantage of allowing you to use other BT controllers (PS4, Switch Pro, Wii U, etc..).
Though the Bluetooth version is also $5 more for the M30 controller, and then you also have to buy a $20 receiver.

Here are the rated in out latencies for both (according to a recent test here https://www.retrorgb.com/krikzz-joyzz-vs-8bitdo-m30-2-4g-vs-8bitdo-m30-bluetooth-input-latency-lag-testing.html )
M30 2.4g = an unnoticeable 3.6ms
M30 Bluetooth = 21ms (which some people may notice, but most people won't)

Question 4

Can this be used with Raspberry Pi?

Accepted Answer

This version (2.4Ghz) will connect to Rasperry Pi, PC, or Switch if you use it as a wired controller with a USB cable. It will not work wirelessly with them. If you want this controller to work wireless with the Raspberry Pi you should buy the Bluetooth model which is $29.99. 
I have this version, it only works wirelessly with the included dongle which only plugs into a Genesis style port. 
The difference between 2.4Ghz and Bluetooth is products labeled as 2.4Ghz use proprietary connectors that will be bound to its wireless receiver(s) out of the box where Bluetooth is a standard many products use to connect so you can often choose different receivers that use Bluetooth as well.

ASIN	B07HB1XFQW
Amazon 売れ筋ランキング	パソコン・周辺機器 - 103,293位 ( パソコン・周辺機器の売れ筋ランキングを見る ) USBアダプタ - 2,566位
GTIN (Global Trade Identification Number)	00193885950499, 06922621500834
UPC	193885950499
おすすめ度	4.6 5つ星のうち4.6 (1,350) var
カラー	ブラック
コントローラーの種類	ゲームパッド
ハードウェアプラットフォーム	Sega Genesis
パッケージ商品数	1
ブランド名	8Bitdo
ボタン数	14
メーカー名	エス・アール・プロジェクト(SRPJ)
メーカー型番	6922621500834
ユニット数	1.0 個
互換性のあるゲーム機モデル	SEGA Mega Drive HAA-2500
商品の重量	0.2 ポンド
商品本体サイズ	14.4 x 2.6 x 6.3 cm
型番	6922621500834
対応アイテム	PC, ゲーム機
接続方式	USB
特殊機能	ワイヤレス

8BitDo M30 2.4G Wireless GamePad for MD ブラック【メガドライブ/SWITCH(有線)用コントローラー】 - Switch [SRPJ2142]

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Description

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Common Questions

8BitDo M30 2.4G Wireless GamePad for MD ブラック 【メガドライブ/SWITCH(有線)用コントローラー】 - Switch [SRPJ2142]

Details

Details

Description

Specifications

Common Questions

8BitDo M30 2.4G Wireless GamePad for MD ブラック【メガドライブ/SWITCH(有線)用コントローラー】 - Switch [SRPJ2142]