02 April 2019 User ReviewCheck your delivery options:
HM-10 by Huamao Technology; BT Version: V4.0 BLE bluetooth; Firmware: V540; Flash:256Kb
USB Protocol: USB V2.0; Working frequency:2.4GHz ISM band; Modulation method: GFSK(Gaussian Frequency Shift Keying)
RF Power:≤4dBm, Class 2; Sensitivity:≤-84dBm at 0.1% BER; Transmission Rate: Asynchronous: 6 kbps; Synchronous: 6 kbps; Security: Authentication and encryption; Support Service: Central & Peripheral UUID FFE0, FFE1
Long range: there is 100 meters in open space with iphone4s
The power can be adjusted -23dbm, -6dbm, 0dbm, 6dbm, through an AT Command (AT+POWER).; Power: 0.5 mA for standby, Active 8.5 mA, supports auto sleep.