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We have Blueooth modules, the BlueSMiRF range and the BLE (bluetooth low energy) modules in stock. For short range, bluetooth is an easy to understand protocol.
Adafruit Feather 32u4 Bluefruit LE£38.87
the Adafruit Feather 32u4 Bluefruit - our take on an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging.
Bluefruit LE Sniffer - Bluetooth Low Energy (BLE 4.0) - nRF51822£33.31
Adafruit Feather M0 Bluefruit LE£27.68
At the Feather M0's heart is an ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz and at 3.3V logic, the same one used in the new Arduino Zero
Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE)£19.46