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: AndoerModel: WS-25Material: PlasticColor: BlackGN: 18Recycle Time: 3 secondsPowered By: 2 * AA battery (batteries not included)Item Size: 8.5 * 5.9 * 2.6cm / 3.3 * 2.3 * 1inItem Weight: 61g / 2.2ozPackage Size: 9 * 6.8 *4.6cm / 3.5 * 2.7 * 1.8inPackage Weight: 83g / 2.9ozPackage List:1 * WS-25 Slave FlashNote:Batteries and camera are not included.Never reverse the polarity when installing batteries.