The Varia™ RTL510 default light mode is solid. You can switch the device to night flash and day flash modes by pressing the device key. You can switch the device to standby mode by pressing the device key. The device does not detect vehicles in standby mode.

The Varia RTL511 has the solid mode only. You can switch the device to standby mode by pressing the device key. The device does not detect vehicles in standby mode.