Does this have an always on mode or a low voltage trickle charge mode?

ASIN	B07K9HJR4X
Antenna Location	Emergency Phone
Battery Capacity	3000 Milliamp Hours
Battery Cell Type	Lithium Polymer
Battery Weight	60 Grams
Best Sellers Rank	#36,643 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #973 in Cell Phone Portable Power Banks
Brand	Attom Tech
Built-In Media	Charging Cable
Color	White
Compatible Devices	All phones, tablets and small USB devices. All series of iPhone, iPad, Samsung Galaxy, Google
Compatible Phone Models	iPhone X, iPhone 8, iPhone 8 Plus, iPhone 7, iPhone 7 Plus, iPhone 6/6S, iPhone 6/6S Plus, iPhone 5/5S/SE, iPhone 5C, Samsung Galaxy S 9, Samsung Galaxy S 9 Plus, Samsung Galaxy S 8, Samsung Galaxy S 8 Plus, Samsung Galaxy S 7, Samsung Galaxy S 7 Edge, Samsung Galaxy S 6, Samsung Galaxy S 6 Edge, Samsung Galaxy S 5,
Connector Type	USB Type C
Customer Reviews	4.0 out of 5 stars 289 Reviews
Item Dimensions	2.1 x 3.3 x 0.35 inches
Item Dimensions L x W x Thickness	3.3"L x 2.1"W x 0.35"Th
Manufacturer	Attom Tech LLC
Model Number	PWBK-0011
Number of Batteries	1 Lithium Polymer batteries required. (included)
Number of Ports	2
Other Special Features of the Product	Fast,Portable
Power Source	Battery Powered,Corded Electric
Reusability	Rechargeable
Special Feature	Fast,Portable
UPC	699962790694
Unit Count	1 Count
Voltage	5 Volts
Warranty Type	Limited

Attom Tech USB Output Super Slim Power Bank Ultra Thin 3000mAh Portable Charger, Micro USB and USB-C Dual Input Ports Mini External Phone Battery Pack Small Emergency Phone Power Backup (White)