PTR5518 Coin-size Bluetooth Low Energy System on M.
XunTong Tech
PTR5518 - Coin-size Ultra Low Power Bluetooth 4.0 Low Energy RF Module
PTR5518 Coin-size Bluetooth Low Energy System on Module Embedded Cortex™ M0 32 bit processor The PTR5518 ultra-low power Bluetooth Low Energy/2.4GHz P.