What is the conversion efficiency? In other words, how much power is lost through the cable?

The cable is not “active” so the cable does not convert power. It only tells the pd power supply that it needs the voltage it uses, the pd power supply then outputs the desired voltage. The conversion efficiency is in your pd power supply, which should be good since its converting from mains to the desired voltage, not mains to 5v then boost converting to 19v, etc. What the other responder is saying, you can calculate the loss in copper of this cable, but that is effectively nothing at this length.

Will it compatible with 15V 0.8A? (House of marley get togeter duo (not get togeter duo lol))

Yes, it is compatible with 15V 08A.

Do you make the reverse version of this cable, e.g. 12v input and usb c pd power output?

no . it only support 12V DC output.

Is this center positive?

Yes, Centerpositive on my USB_C pf 15 Volt cable

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Description

⚡ Power your gear, save the planet, and never miss a beat!

PEACE OF MIND WARRANTY - Backed by a 1-year warranty and lifetime technical support with 24-hour response.
POWER UP WITH PRECISION - Built-in PD smart sink chip delivers a stable 12V output for reliable fast charging.
UNIVERSAL COMPATIBILITY - Seamlessly converts USB Type-C PD power to a standard 5.5mm x 2.5mm DC interface for versatile device support.
ECO CONSCIOUS INNOVATION - Designed with sustainability in mind to reduce waste and environmental impact.
CHARGE AT LIGHTNING SPEED - Supports up to 3A current and USB PD fast charging with compatibility up to 100W adapters.

The DSD TECH MagicConn SH-CP12A is a 1.2m USB Type-C to DC power cable featuring a built-in PD smart sink chip that ensures stable 12V output at up to 3A current. Compatible with USB PD fast chargers up to 100W, it converts Type-C PD power to a 5.5mm x 2.5mm DC interface, ideal for powering various electronic devices. Designed with eco-friendly principles, it reduces resource waste and supports sustainability. Comes with a 1-year warranty and lifetime technical support.

Specifications

Brand	DSD TECH
Connector Type	USB Type C
Cable Type	USB
Compatible Devices	Charging Adapter
Special Feature	Fast Charging
Compatible Phone Models	USB-C PD enabled smartphones
Recommended Uses For Product	Power supply for electronic devices with USB Type C interface
Colour	black
Connector Gender	Male-to-Female
Shape	Flat
Number of Pins	24
AC Adapter Current	3 Amps
Net Quantity	1.0 Count
Model Name	SH-CP12A
Specification Met	Usb Type-c, Power Delivery
Indoor/Outdoor Usage	Outdoor
Number of Items	1
Customer Package Type	Flat Package
Wattage	45 Watts
Maximum Voltage	12 Volts (DC)
Manufacturer	DSD TECH
UPC	794251082204
Model	SH-CP12A
Package Dimensions	20 x 14.7 x 1.4 cm; 20 g
Item model number	SH-CP12A
Special Features	Fast Charging
Voltage	12 Volts
Batteries Included	No
Batteries Required	No
Connector Type	USB
Material	iron
Country of Origin	USA
Item Weight	20 g

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