Qunqi Bluetooth 4.0 HM-10 HM10 BLE Module Logic Level Conversion / Anti Universal For Arduino Module Function : Bluetooth Dimension(cm) : 4.7**1.6*0.6 converse 5V level to 3.3V level power input port has anti-reverse circuit, which can avoid wrong plug direction of power-causeing module and lead to burn out. 1. Support for Apple IOS5 / IOS6 system 2. Working frequency: 2.4GHz ISM band 3. Modulation method: GFSK ; *Flash: 256Kb 4. RF Power: 4dBm, Class 2 5. Sensitivity: -84dBm at 0.1% BER 6. Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps 7. Synchronous: 1Mbps/1Mbps(Max) 8. Security: Authentication and encryption 9. Service: Bluetooth SPP(Master &amp; Slave) 10. Power: +3.3VDC 50mA 11. Working temperature: 5 ~ +65 Centigrade 1x HM10 HM-10 Module