What kind, how many, and how long do the batteries last?

The Sierra headset requires two AA batteries. Use alkaline batteries for best performance, although lithium batteries may provide improved battery life in colder temperatures. We do not recommend using rechargeable batteries or mixing battery types and brands. A set of batteries provide an average of 40 hours of power. However, Bluetooth usage will impact battery life.

What happens if my batteries run out in flight?

If you lose power at any time, Sierra will continue to perform as a passive headset. When batteries begin to run low, the power LED flashes red, and the headset will continue to operate. Install new batteries as soon as possible at any indication of low batteries. We recommend you add checking your headset batteries on your preflight checklist.

Why do I hear radio communications in only one ear?

Sierra's Stereo/Mono DIP switch is probably set to Stereo while your audio panel is transmitting a mono signal. To fix this, change Sierra's Stereo Mono DIP switch to Mono. This setting does not affect music or audio from auxiliary devices; you can hear stereo sound on auxiliary devices even when the Stereo/Mono DIP switch is set to Mono.

How do I connect my Sierra headset with my Bluetooth device?
1.   Turn on the headset and verify the green LED is flashing. Make sure Sierra’s Bluetooth mode is turned off. Blue or red flashes from the Bluetooth LED should not be present.
2.   Press and hold the Sierra Bluetooth button for about five to ten seconds or until the Bluetooth LED continually flashes red and blue. This indicates the Sierra pairing mode setting and lasts about two minutes. If this step takes longer and the Bluetooth LED is no longer alternating red and blue, start over from step one.
3.   With Sierra in pairing mode, follow the menu prompts on your Bluetooth device directing it to look for Bluetooth devices.
4.   Select Lightspeed-V### (numbers may vary) on your Bluetooth device from the list of found devices.
5.   If asked to enter a password or PIN, enter 0000. Your device should now be paired and ready for continued use with Sierra. When you turn on the Sierra Bluetooth mode it will connect to the most recently paired device.

Note: The microphone will not transmit unless plugged into an intercom.

Why doesn't my Bluetooth phone accept Sierra's 0000 passcode?

Your headset may not be in pairing mode. Some phones prompt for a pass code without checking for pairing mode. When the phone cannot pair with the headset, it rejects the passcode. To enter pairing mode, you must start with Bluetooth mode turned fully OFF.

How can I reduce static noise during cell phone calls?

To reduce RF interference during phone calls, keep cell phones at least 12 inches from the Sierra controller and headset when making calls.

When flying, what causes a thumping or warbling noise in the ear cup?

To gain peak performance from the ANR feature designed into your Lightspeed headset, it is necessary to have a solid seal around your ears. Without a tight seal, air can seep in and cause the ANR to compensate for uneven internal cup pressure, often resulting in a warbling noise. If you are experiencing this issue, please contact customer service so that we may assist you in identifying and correcting the problem. Customer service may be reached at: 1-800-332-2421 or service@lightspeedaviation.com.
Where is the serial number located?

The Sierra serial number (a small, white, bar-code sticker with numbers) can be found on the headset underneath the head pad. The head pad, located on the inner radius of the headband, must be removed to reveal the serial number. Simply pinch the cushioned middle part of the head pad, pull straight down, the cushion will invert, and you will see the sticker on the headband.