Product features:

Brand new and high quality.
Send and receive no bytes limit.
The power can be adjusted -23dbm, -6dbm, 0dbm, 6dbm, can modify through AT Command AT+POWE.
Long range, Open space have 100 Meters with iphone4s.
Low Power: Only 0.5 mA for standby, Active 8.5 mA, support auto sleep.
Central & Peripheral in one.
UUID FFE0, FFE1.
Support serial port update firmware (add in V508).
 
Package Included:
1 x  Compatible HM-10 CC2541 CC2540 4.0 Bluetooth UART Transceiver Module Transparent Serial Port