Will this work with Raspberry Pi 2?

No. It will work momentarily but it will disconnect from the network after 5 mins. SSH sessions drop within 2 minutes. This is using Rasbian so it may work better on a different OS

Is there a similar device that will connect a tablet to my computer without wires?

No, there isn't. But, if your computer is bluetooth compatible, you can connect your tablet to your PC via bluetooth technology.

how many meters does it pick up a wireless?

I have been unable to determine its effective range but I live in a two-story house with a basement and I can take my laptop anywhere in the house without losing my wireless connection.

Is this a dual band adapter. Will it see both 2.4 Ghz and 5.0 Ghz signals?

The confusion comes from the fact that this listing has four different adapters listed as choices to select. Two of the four are dual band adapters for 2.4 and 5 GHz.

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TP-Link TL-WN823N N300 Mini USB Wireless WiFi Network Adapter for pc, Ideal for Raspberry Pi

TP-Link TL-WN823N N300 Mini USB Wireless WiFi Network Adapter for pc, Ideal for Raspberry Pi

Product ID: 436269

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Details

Brand
TP-Link
Hardware Interface
USB 2.0
Color
Black
Compatible Devices
Desktop
Product Dimensions
1.54"L x x
Data Link Protocol
IEEE 802.11b

📶Up to 300Mbps wireless speed

🔌Mini USB plug & play design

🔒One-touch WPS security encryption

Description

🚀 Mini adapter, mega performance—stay connected, stay ahead!

BROAD COMPATIBILITY - Supports Windows XP through 8 and Mac OS 10.4-10.8 for versatile plug-and-play use.
INSTANT SECURE ACCESS - One-touch WPS button ensures your network stays locked down without hassle.
CREATE YOUR OWN HOTSPOT - SoftAP mode lets you share wired internet by turning your PC into a Wi-Fi hotspot.
POCKET SIZED POWERHOUSE - Ultra-compact design fits anywhere—perfect for on-the-go pros and Raspberry Pi enthusiasts.
BLAZING FAST CONNECTIVITY - Stream, game, and call seamlessly with up to 300Mbps speeds.

The TP-Link TL-WN823N is a compact N300 USB wireless adapter delivering up to 300Mbps speeds, ideal for streaming, gaming, and internet calls. Its mini design ensures portability, while one-touch WPS encryption and SoftAP hotspot mode provide secure, flexible connectivity. Compatible with a wide range of Windows and Mac OS versions, it’s perfect for PCs and Raspberry Pi setups.

Specifications

Memory Speed	1800
Wireless Type	802.11b
Brand	TP-Link
Item model number	TL-WN823N
Hardware Platform	Mac, PC
Operating System	Windows 7(32/64bits) Windows Vista(32/64bits) Windows XP(32/64bits)
Item Weight	2.12 ounces
Product Dimensions	1.54 x 0.72 x 0.31 inches
Item Dimensions LxWxH	1.54 x 0.72 x 0.31 inches
Color	Black
Number of Processors	1
Computer Memory Type	DRAM
Voltage	220
Batteries	1 Lithium Ion batteries required.
Manufacturer	TP-LINK USA
Language	English
ASIN	B0088TKTY2
Is Discontinued By Manufacturer	No
Date First Available	May 23, 2012