AT Command Bluetooth Module Demo Board (Module: MDBT42Q-AT2) Pre-Loaded with Raytac's AT command firmware (Peripheral / Slave role) A recommended 3rd-party module by Nordic Semiconductor. Built in Raytac Module MDBT42Q-AT2 /
Chip Antenna Compact size module: 10 x 16 x 2.2 mm (approx. 0.40 x 0.63 x 0.09 in) BT 5.2 Bluetooth Specification Certified FCC/IC/CE/Telec/KC/SRRC/NCC/RCM/WPC Pre-certified Module.