Brand: RadioShack. MPN: 272-1145. # s on Back 12A03272-1145For replacement and special projects. Maximum anode voltage 400VOperating anode voltage: 300VMaximum flash energy 4 watt secondsTrigger voltage 4kV(min)Maximum flash frequency 60/minuteFlash duration: 1-2 ms SKU:ADIB0054GMT0O.