What functionalities do you want in your #PebbleTime Smartstrap?

We know that everything won't fit in a strap, so let's make the developers see what we want more to help them create the perfect Pebble straps for sport, battery, general use, etc.

Select all the options you want.

UPDATE 2015-03-13: This poll was based in hardware functinalities to help future developers, not in how apps will use those smartstraps, but someone in KS Comments (https://www.kickstarter.com/projects/597507018/pebble-time-awesome-smartwatch-no-compromises/comments) noticed that it would be good to know possible usages. So I keep in mind that:

- Sound: Any option -speaker, headset connector, BT handsfree- can be used for alarms, listening music, getting Siri/Google Now/any replies, phone calls, etc.

- Storage: Any option -internal, SD reader- can be used for stand-alone music -if sound available-, pictures, documents, USB-stick-like -if micro-USB charging available-, etc.

- Sensors: You may be thinking about fitness when you read heart rate, but think about medical, too. You may be thinking about usage when you read gyro strap, but think about parkinson too. You may be thinking about paying when you read NFC, but think about opening doors, pairing with a new device, etc. And so on...

UPDATE 2015-03-13 (2): Added ANT+ http://en.wikipedia.org/wiki/ANT%2B), a connectivity alternative for sensors. There have been +3000 votes so far, and I'm sorry I didn't add it before, but I didn't know it.
675 votes
Battery: extra juicy
7%
254 votes
Battery: micro-USB charging
3%
375 votes
Battery: qi charging
4%
495 votes
Battery: solar charging
5%
583 votes
Battery: kinetic harging
6%
110 votes
Controller: more buttons
1%
275 votes
Controller: IR remote
3%
90 votes
Display: 2nd screen
1%
115 votes
Display: flexible screen
1%
348 votes
Display: notification leds
4%
588 votes
Sound: speaker
6%
153 votes
Sound: headset connector
2%
171 votes
Sound: binded bluetooth handsfree
2%
136 votes
Storage: internal
1%
150 votes
Storage: microSD reader
2%
143 votes
Sensors: accelerometer (Pebble Time already has it!!)
1%
1,158 votes
Sensors: heart rate
12%
363 votes
Sensors: thermometer
4%
222 votes
Sensors: barometer
2%
206 votes
Sensors: gyro strap to track gestures
2%
91 votes
Sensors: compass (Pebble Time already has it!!)
1%
823 votes
Sensors: GPS
9%
81 votes
Sensors: barcode scanner
1%
130 votes
Sensors: fingerprint
1%
163 votes
Sensors: Cammera
2%
365 votes
Connectivity: Wi-Fi
4%
832 votes
Connectivity: NFC
9%
161 votes
Connectivity: ANT+
2%
263 votes
Other: flashlight
3%
47 votes
Other
0%