The MS45SF1 is a chip Bluetooth 5.4 module designed using the Nordic nRF5340. It has 1 MB FLASH, 512 KB RAM, a floating point unit (FPU), an 8 KB 2-way associative cache, and instruction functions; processor has a frequency of 64 MHz and is optimized for low power consumption and efficiency, and it comes with 256 KB FLASH and 64 KB RAM, enabling more powerful computing capabilities and floating point technologies It can realize very complex algorithms. Item : nRF5340 Ble Module Model Number : MS45SF11 Type : Bluetooth 5.1 Application : Social distance, position, broadcast, marketing SoC TX power : -20dB to +3dBm Chipset : nRF5340 GOIP Quantity : 48 Power supply : 1.7-5.5V Range : 10-250 meters Processor : Two ARM -M33 128/64MHz Operating Temperature : -40 to +85 Flash and RAM : 1M Flash and 512 RAM Colour:Black+Silver Material:ABS Package Contents: 1 x Bluetooth adapter board 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.