The HZX-51822-16M04 is a highly integrated Bluetooth 4.0 BLE module. The module is designed based on Nordic Semiconductor nRF51822 radio Transceiver IC– the Multiprotocol Bluetooth 4.0 low energy/2.4 GHz RF SoC designed for ULP (ultra-low power) wireless, has a 32 bit ARM Cortex-M0 CPU, flash memory and analog and digital peripherals. The HZX-51822-16M04 provides a low power and ultra-low-cost BLE and proprietary protocols for wireless transmission applications. The HZX-51822-16M04 is a 17mm×25mm micro-module with embedded PCB antenna. It allows developers to take full advantage of the nRF51822 by making all its I/O ( except P0.26 and P0.27 for 32.768 kHz crystal oscillator )available via 36 SMD/Through-hole 1.1mm pitch pads. The module can be mounted with header pins in order to re-use during development and prototyping phase and SMD it for production to be the most cost-effective. You can choose the module HZX-51822-16M04G, which has an ultra-low-power high-performance three-axis linear accelerometer device(G-sensor)—LIS3DH