based on nRF52840, it is pretty small in size, yet still provides stable and reliable performance, can be directly integrated into kinds of products. Communication distance: 150m (open outdoor), 40m (indoor) Data rate: 2Mbps, 1Mbps, 500kbps, 125kbps Operating voltage: 2.0V ~ 3.6V (3.0V recommended) Operating temperature: -40℃ ~ 85℃ Storage temperature: -55℃ ~ 125℃ Compatible with nRF52, nRF51, nRF24L, and nRF24AP series ARM Cortex-M4F 32-bit processor (with FPU, 64MHz) Core52840 Applications:Wearable devices. Smart home appliances,Industrial IoT control,Interactive entertainment devices