... wheel for brightness adjustment, unique LED state light for sync change indicated, user can simply know the LED working ... . 3. Advanced RF and wireless sync/zone control technology, no sync signal wire between receivers, sync capability is stable and reliable. 4 ... 30mA Working frequency 2.4GHZ transmitting distance 30m Remote option Sync or zone control Battery capacity 1000mAh Standby time ≤6 months ...