What is the difference between different model numbers: eg. 508341, 504576 508342?

All 3 models are working almost the same as sound quality. The difference is the extras accesories in the model packages and PC compatible in the UC models. 1. Sennheiser Presence Grey Business: (508341) - Dual Connectivity, Single-Sided Bluetooth Wireless Headset for Mobile Device & Softphone/PC Connection. NO USB DONGLE - NO CAR CHARGING ADAPTOR - NO CARRYING CASE. COME WITH JUST THE USB CABLE CHARGER 2. Sennheiser Presence Grey UC (508342) - Dual Connectivity, Single-Sided Bluetooth Headset for Mobile Device & Softphone/PC Connection - WITH CARRYING CASE - USB DONGLE - USB CHARGING CABLE. 3. Sennheiser Presence UC (504576) - Dual Connectivity, Single-Sided Bluetooth Headset for Mobile Device & Softphone/PC Connection - WITH CARRYING CASE - USB DONGLE - CAR CHARGING ADAPTOR - USB CHARGING CABLE - Compatible with Major UC Platform Compatible. I bougth Sennheiser Presence UC model 504576 for reason it came with all the accessories needed and working with most PC features

Yes. Connects to your phone by bluetooth.

How do I keep from closing the boom while in my pocket? Effectively turning it off.

I keep mine in my pocket when working in the warehouse. It connects so quickly when you slide the boom out that I've never missed a call. I just did a quick test and from the time I pulled the boom out until it was fully connected and ready to answer a call was less than 2 seconds.

When connected to 2 devices simultaneously, how do you switch between them?

it is automatic, the phone takes priority during a call over say your computer. if you are talking about between two phones then it would be like a conference call. I recommend answering the 2nd call without the Bluetooth.

Headphones Jack	usb
Model Name	PRESENCE™ Grey Business
Connectivity Technology	Bluetooth
Wireless Communication Technology	Bluetooth
Included Components	PRESENCE™ Grey Business headset, USB charging cable, ear hook, 4 x ear sleeves, safety guide, quick guide
Age Range (Description)	Adult
Material	Plastic
Charging Time	1.2 Hour
Compatible Devices	Compatible with two mobile Phones, or a Cell phone & PC, to allow for seamless transitions between connected Bluetooth devices
Control Type	Call Control
Cable Feature	Without Cable
Item Weight	13 Grams
Water Resistance Level	Not Water Resistant
Unit Count	1.0 Count
Style	Grey without Bluetooth dongle
Control Method	Voice
Number of Items	1
Battery Life	10 Hour
Audio Driver Type	Dynamic Driver
Bluetooth Version	5.0
Earpiece Shape	In Ear
Hardware Interface	Bluetooth, USB
UPC	840064404600 615104320802
Input Device Interface	Bluetooth
Noise Control Features	active_noise_cancellation
Generation	1
Supports Bluetooth Technology	Yes
Special Feature	Lightweight, Noise Cancellation
Global Trade Identification Number	00615104320802, 04044155243031
Manufacturer	Sennheiser
Item Weight	0.459 ounces
Product Dimensions	2 x 4 x 8 inches
Item model number	PRESENCE™ Grey Business
Batteries	1 C batteries required. (included)
Is Discontinued By Manufacturer	No
Material Type	Plastic
Size	Single-sided
Manufacturer Part Number	508341
National Stock Number	0

Sennheiser Presence Mono Bluetooth Earphone, Black

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