A Bluetooth module with BLE functionality?

Using Arduino Microcontrollers
1

Hi,

Looking for a BT module that lest u know proximity to? any?

or an Class 3 BT module?

2

No common wireless technology is capable of determining proximity with an accuracy of better than 20 metres. This is because signal strength can vary over orders of magnitude depending on antenna orientation and intervening materials such as walls, earth and vegetation.

Short range radar is possible and available, but not inexpensive.

3