WT41 is a long range class 1， Bluetooth? 2.1 + EDR module. WT41 is a highly integrated and sophisticated Bluetooth? module， containing all the necessary elements from Bluetooth? radio to antenna and a fully implemented protocol stack. Therefore WT41 provides an ideal solution for developers who want to integrate Bluetooth? wireless technology into their design with limited knowledge of Bluetooth? and RF technologies. WT41 is optimized for long range applications and since it contains a RF power amplifier， low noise amplifier and a highly efficient chip antenna. With 115 dB radio budget WT41 can reach over 1 km range in line off sight. By default WT41 module is equipped with powerful and easy-to-use iWRAP firmware. iWRAP enables users to access Bluetooth? functionality with simple ASCII commands delivered to the module over serial interface - it‘s just like a Bluetooth? modem.