Summarize the following:
DACs convert your phone's digital sounds to analogue; while every phone has a built-in DAC, purchasing an external one will both boost the power of the analogue sound and enable you to attach otherwise incompatible hardware-- in this case, a standard set of 3.5 millimeter headphones. Some popular DAC options include the following: Chord Mojo - A large DAC with a secondary headphone input that plugs into your phone via USB cable ($599 USD). While considered fairly high-quality, the size of the unit and overall price are common complaints. AudioQuest Dragonfly - Another USB DAC with a headphone jack. Comes in standard Black ($100 USD) or the higher-quality Red ($198 USD) models. Common complaints include poor volume control and less refined audio than more expensive counterparts. Arcam MusicBoost S - A DAC built into an iPhone 6 and 6S case ($190 USD). Common complaints include it's limited compatibility (it won't work with a 6 Plus or 6 SE), mandatory charging and limited improvement to sound quality. Make sure your DAC supports a 3.5 millimeter set of headphones before purchasing it-- while most do, you don't want to order an expensive piece of hardware only to find that it doesn't work with your technology. Amazon is a reliable source from which to purchase technology if you plan on ordering online. This should go into the Lightning port at the bottom of your phone. Depending on your model, you may have to complete an installation on your iPhone's screen. The headphone jack location will vary depending on your DAC model. You'll need to fine-tune the DAC's volume since DACs tend to have higher-quality audio output than standard 3.5 millimeter ports. This will open your iTunes library. This should begin playback; if you can hear your music, you've successfully used headphones with a DAC on your iPhone 7! If you can't hear anything in your headphones, try adjusting your phone's volume. You should also check your headphones' connection to the DAC, the DAC's connection to your phone, and any volume options on the DAC itself.

summary: Research digital-to-analogue converter options. Purchase your desired DAC. Plug the Lightning end of the DAC's cable into your phone. Plug the USB end of the DAC's cable into your DAC. Plug your standard headphones into the DAC's other end. Place your headphones in your ears. Unlock your phone, then tap your "Music" app. Tap a song.

Summarize the following:
Bluetooth can be a drain on your battery, so start with a full charge. If your phone was released after 2007, it is most likely Bluetooth-enabled. If you're able to see a "Bluetooth" menu on any of the following operating systems, you'll be all set. If you're using an iPhone, tap the Settings icon and look for a menu item called Bluetooth. If you see it there, your device is Bluetooth-capable. If it says "off" next to Bluetooth, tap it to turn it on. Android users can tap the Settings icon in the app menu and look for Bluetooth there. If the word Bluetooth is the menu, your phone is Bluetooth-capable. Open the Bluetooth menu with a tap and flip the switch to the "on" position. Users with Windows Phones will open the app list and select Settings to find the Bluetooth menu. If you see a Bluetooth menu, your phone is Bluetooth-capable. Open the menu to switch Bluetooth on. If you're using a Bluetooth-capable phone that isn't a smartphone, navigate to your device's settings menu to find the Bluetooth menu. Turn on Bluetooth in that menu. Once you've enabled Bluetooth on your phone, it should automatically begin a search for Bluetooth devices with which to connect. When the search has completed, a list of devices you can connect to will appear on the screen. Regular feature phones (non-smartphones) and older Android models may require you to scan for devices manually. If the Bluetooth menu contains an item that says "Scan for devices" or something similar, tap it to scan. If you don't see any devices despite having turned on Bluetooth, your headset may not be in pairing mode. Restart your headset and re-enable pairing mode. Double-check your Bluetooth headset manual to make sure your particular headset doesn't have a special process for pairing. In the list of connectable Bluetooth devices, tap on the name of your headset. This may be the name of the headset manufacturer (i.e., Jabra, Plantronics) or may simply say something like "Headset." When the phone "finds" the headset, it may ask for a PIN code. Enter the code when prompted, then click "Pair." On the majority of headsets, this code is either "0000," "1234," "9999" or "0001." If none of those work, try the last 4 digits of your headset's serial number (found underneath the battery, labeled as "s/n" or "serial number"). If your phone connects to the headset without a code, it simply means that no code is required. " Once the headset and phone are paired, you'll see confirmation on the phone. It should say something along the lines of "Connection Established" (the actual message depends on your device). The headset and phone are now paired. The functionality on the headset will depend on the software and operation of the cell phone, but by placing the device on your ear in a comfortable position, you will now be able to make and receive phone calls without touching your phone.

summary: Charge your phone. Start Bluetooth on your phone. Scan for Bluetooth devices from your phone. Select your headset for pairing. Provide a PIN code, if asked. Click "Pair. Make hands-free phone calls.

Summarize the following:
Before you even get on the machine you should have an idea of what you want to accomplish for that day. Just hopping on the elliptical and moving is not the most effective or efficient way to workout. Make sure you have an idea of the time you plan to spend on the machine and the level of workout you intend to get. Most ellipticals will have a digital monitor. Before you start your workout, locate the incline buttons and figure out how to adjust the resistance. Some ellipticals have a sticker or other label on them with instructions about how to get the machine started. Each machine is a little different so take the time to get comfortable using the console before starting your workout. If you are at the gym they may have their own instructions posted with additional information. You can also ask one of the trainers to help you get set up. Most elliptical machines will allow you to put in your weight and age. This way the machine can help you track how many calories you've burned during your workout. The handles on some elliptical machines will have sensors on them that can monitor your heart rate as well. Some machines will allow you to plan a workout by adding some additional info including how many calories you want to burn, how long you would like to workout, or what intensity level you are aiming for. For a moderate workout, your heart rate should be 50 to 70 percent of your maximum heart rate. For a vigorous workout you're aiming more for 70 to 85 percent. To calculate your max heart rate subtract your age from 220. If you are 31 you max heart rate is 189. Changing the incline angle of the machine can have a great effect on the intensity of your workout. Keeping the machine at low incline will give you a workout more akin to cross country skiing. A medium incline is more like a bike or spin class, and a high incline will be more like climbing stairs. You can adjust the settings throughout to give your workout variety and help you focus on different muscles.
summary: Set a goal for your time on the elliptical. Take a moment to familiarize yourself with the console. Program in your weight and age. Get comfortable adjusting the incline level.