What's in the box:

Andoer DR-FZ100 DC Coupler Dummy Battery Replace of NP-FZ100 Battery with USB DC Converter Power Cable Wall Plug Compatible with Sony A9 A7R3 A7M3 A7S3 A7III A7R4 A7M4 A6600 Cameras (Eu)

Features:
Replacement for Sony NP-FZ100 battery. Compatible with Sony A9, A7R3, A7M3, A7S3, A7III, A7R4, A7M4, A6600, etc.
The item can connect a power bank for outdoor long time photography or connect the included wall plug when shooting a long time indoors to provide uninterrupted power supply.
Safety Protection: Passed CE certification, build with premium IC chip inside. Featured with over-charging, short-circuit, overheating, over-loading protection, which ensures the absolute safety during use.
USB Power Input: 5V, 2A-4A single USB input design (At least 2A current, up to 4A if needed). DC Output: 8V. Connect directly to various USB power sources for power supplying.
Total cable length is up to 155cm. Long enough, very convenient to put your own power bank or mobile power in your pocket or bag, or at somewhere else.

Specifications:
Brand: Andoer
Model: DR-FZ100
Plug Type: EU plug
Plug Input Voltage: AC 100-240V
Compatibility: Compatible with Sony A9, A7R3, A7M3, A7S3, A7III, A7R4, A7M4, A6600, etc.
Input Voltage & Current for Dummy Battery: USB 5V 2A-4A
DC Output: 8V
DC Jack: 5.5*2.1mm
Cable Length: 155cm
Item Weight: 133g / 4.7oz
Package Size: 12.2 * 11.3 * 3.5cm / 4.8 * 4.4 * 1.4inch
Package Weight: 158g / 5.6oz

Packing List:
1 * Andoer DR-FZ100 DC Coupler Dummy Battery
1 * USB DC Converter Power Cable
1 * Wall Plug