Features: Portable, mini digital slave flash for cameras. With universal hot shoe, can work with any digital cameras. 200 flashes on fresh set of 2 AA alkaline batteries. Auto Pre-Flash Sensor. Built-in Digital Slave. Usage: 1. Put two AA batteries into the flash light, then close the battery cover. 2. Long press \'POWER\' button for 3s, can startup the flash. The default startup mode is M mode. Press \'PILOT\' button, can test flash light. 3. After use, long press \'POWER\' button for 3s, can be powered off, remove the battery if unused for long periods.