Product A: USB Bluetooth 5.0 Adapter

Specifications:
Item Name: V5 Bluetooth 5.0 Adapter
Interface: USB 2.0
Transfer rate: Max 24Mbps
Bluetooth Version: Bluetooth V5.0
Frequency Band: 2.400-2.480GHz
Color: Black
Item Size: 21x16x5 mm
Operation System: Windows 7/ 8/ 10/ Vista/ XP/ 2000/ 98/ Me etc.
Low-power selectable :1.2 to 3.6 VI/O.
Supporting multiple languages.
Compatible with Bluetooth v1.2/2.0/2.1/3.0/4.0
Supporting multiple languages.

Product B: USB Bluetooth 4.0 Adapter

Features:
1. Fits for bluetooth 4.0 standard, dual mode transmission.
2. Stable and strong signal, low power consumption.
3. Built-in antenna, up to 20M long distance transmission.
4. 3Mbps transmission rate, suitable for files and music transmission.
5. Backwards compatible with for bluetooth 2.0, 2.1, 3.0 standard.
6. High speed, free drive, plug and play, stable and secure.
7. For desktop: easy to access network with this product.

Specifications:
Type:USB for bluetooth adapter
Interface:USB 2.0
Working frequency:50MHz
Material:Plastic, metal
Color:Black
Transmission rate:3Mbps
For bluetooth standard:4.0
Operation systems:for Windows XP/7/8/10
Effective semidiameter:10M
Plug and play:Support