Built-in wireless radio control
Use this flash with a compatible camera[FN|Dependent on camera body and lens specifications.], for multi-flash shooting, even under strong sunlight or from relatively distant location thanks to its radio-controlled system. HVL-F45RM can be either wireless commander or receiver. As a commander, HVL-F45RM supports up to 15 units of compatible flashes or receivers in up to 5 groups[FN|Up to 5 groups in GROUP mode setting, up to 3 groups in TTL or Manual mode settings.], for connecting with remote units at up to 30 meters[FN|According to Sony’s internal measurement conditions.]. It also works with optical wireless communications.