Product description: The nRF52833 in the module is a cost-effective and low-power loss SOC solution that fit for Bluetooth low-power loss' application. It owns a RF transceiver of -M4F ARM core operating at speed of 64Mhz. Besides, it has 512kB FLASH programmer space, 128kB RAM and other matching powerful resources. MS51SF11 is a very tiny BLE5.2 module base on highly flexible nRF52833 SoC. The strong 32-bit ARM CortexTM M4F CPU, 512kB Flash, 128kB RAM and integrated 2.4GH transceiver inside can provide wonderful solutions for bluetooth connecting. The chip nRF52833 is to support ANT, BLE, BLE MESH, ZIGBEE and THREAD protocols, etc. What makes product work in environment with requirement on product is the tiny size of 9.8 x 8.4mm, PCB antenna, design of ANT pin connect external antenna. Material: PC+Metal colour: As shown Package Contents: 5 x Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.