How long does it take to charge the first time?

Depends upon how much has been discharged, but shouldn't longer than a couple of hours for a fully depleted one.

Exactly what device do you need to plug it into a 120 volt wall circuit for charging the batteries?

You need a usb to 120v adapter. The same as you would use for your cell phone into a 120v receptacle

Can you use a Samsung cordless phone charger? the charging cord fits. When you plug it in , the red lites blink.

Check the output on the part you plug into wall. It should not be more than the input on batt. Charger.

Does it come with power outlet charger? in case of a negative answer, can i use any standard 5v/2.0a charger?

No it doesn't come with wall charger but comes with cable. Use at least 2.1 amp charger. Lower amp wall adapters will work just slower. Can also charge from a laptop

ASIN	B07RT332DY
Best Sellers Rank	22,280 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 37 in Household Battery & Charger Sets
Guaranteed software updates until	unknown
Item model number	9V
Manufacturer	LP
Package Dimensions	10.9 x 8.2 x 3.81 cm; 90.72 g

9V Rechargeable Battery Charger Pack, LP 4-Pack 600mAh 9 Volt Li-ion Batteries & 4-Bay Battery Charger for Alarms, Wireless Microphones, Smoke Detectors, Toys, Flashlights, Guitar, Keyboard & More

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