Not sure how arms would work. If you're holding the joycons it wouldn't be able to head track as the.switch has no accelerometers. At best it would be arm.
It is a common misconception, here are the Switch breakdown by Nintendo :
Nintendo Switch™ console
Size: Approximately 4 inches high, 9.4 inches long, and 0.55 inches deep (with Joy-Con attached)
*The depth from the tip of the analog sticks to the tip of the ZL/ZR buttons is 1.12 inches
Weight: Approximately .66 lbs
(Approximately .88 lbs when Joy-Con controllers are attached)
Screen: Multi-touch capacitive touch screen / 6.2-inch LCD Screen / 1280 x 720
CPU/GPU: NVIDIA Custom Tegra processor
Storage: 32 GB of internal storage, a portion of which is reserved for use by the system. Users can easily expand storage space using microSDHC or microSDXC cards up to 2TB (sold separately).
Wireless: Wi-Fi (IEEE 802.11 a/b/g/n/ac)(*) Bluetooth 4.1
(*In TV mode, Nintendo Switch systems can be connected with a wired LAN adapter - sold separately)
Video output: Up to 1080p via HDMI in TV mode, Up to 720p via built-in screen in tabletop mode and handheld mode
Audio output: Compatible with 5.1ch Linear PCM output
Output via HDMI connector in TV mode
Speakers: Stereo
Buttons: Power button / Volume button
Headphone/mic jack: 3.5mm audio jack
Game card slot: Nintendo Switch game cards
microSD card slot: Compatible with microSD/microSDHC/microSDXC memory cards
*Once the microSDXC card is inserted, a system update will be necessary. An Internet connection is required to perform this system update.
Sensor: Accelerometer, gyroscope, and brightness sensor
Operating environment: 41-95 degrees F / 20-80% humidity
Internal battery: Lithium-ion battery/4310mAh
Battery life Approximately 2.5 - 6.5 hours
*The battery life will depend on the games you play. For instance, the battery will last approximately 3 hours for
The Legend of Zelda: Breath of the Wild.Charging timeApproximately 3 hours
*When charging while the hardware is in sleep mode