3Pcs KEYES HM-10 6-Pin Transparent BLE bluetooth V4.0 Serial Port Module With Logic Level TranslatorDescription: 1. Internal with logic level conversion circuit. No external 5V level to turn into a 3. 3V level 2. Power input with anti anti circuit. Avoid accidental power plug reversed, leading to the burning question. IOS: (For IPHONE 4s, 5, 5s or later): 1. IOS search for bluetooth, not in the set "Searching for and pairing bluetooth bluetooth inside. (You can only connect a bluetooth headset within IOS settings. Unable to find a wireless data
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3Pcs KEYES HM-10 6-Pin Transparent BLE bluetooth V4.0 Serial Port Module With Logic Level Translator