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. Specifications: Brand: Andoer Model: WS-25 Material: Plastic Color: Black GN: 18 Recycle Time: 3 seconds Powered By: 2 * AA battery (batteries not included) Item Size: 8.5 * 5.9 * 2.6cm / 3.3 * 2.3 * 1in Item Weight: 61g / 2.2oz Package Size: 9 * 6.8 *4.6cm / 3.5 * 2.7 * 1.8in Package Weight: 83g / 2.9oz Package List: 1 * WS-25 Slave Flash Note: Batteries and camera are not included. Never reverse the polarity when installing batteries.