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HC-05 Bluetooth Module with Breakout Board..This comes with a tiny push button switch to enable programming.HC-05 module  Bluetooth SPP (Serial Port Protocol) module, designed for wireless serial connection setup. It has EDR (Enhanced Data Rate) of 3Mbps Modulation with complete 2.4GHz radio tr..

Description:The core module HC-06 main modules, leads the interface includes VCC, GND, TXD, RXD, KEY pin high trigger to clear the pairing information re searchled indicate Bluetooth connection status, flash unpaired slow flash indicates paired but not slave connection, Always follow machine connect..

this hm-10 bluetooth module with BLE 4.0 support, Internal with logic level conversion circuit. No external 5V level to turn into a 3.3V level Power input with anti-anti-circuit. Avoid accidental power plug reversed.Generally, users are using HC-05 Bluetooth module but it doesn't support with i..