SainSmart Bee Bluetooth Master Module for Robot Arduino UNO MEGA2560 R3 Duemilanove 2013 (Default: Master) This Bluetooth module supports slave mode. XBEE design, compact size to compatible XBEE docking. Compact size to compatible XBEE docking. Can set the parameters through a simple AT command. Can use the AT command set the baud rate and master-slave mode.