Features: Standard dimension of Raspberry Pi HAT, compatible with all Raspberry Pi expansion boards Cascading design allows space-saving stacking while powering Raspberry Pi and expansion boards without blocking GPIO access Supports up to 2A quick-charge technology for fast battery charging Simultaneous charging and power supply to Raspberry Pi Equipped with 4 LED power indicators Includes example code to help beginners display battery capacity, current battery level, voltage, and other parameters in Raspberry Pi programs Removable battery design allows users to replace with a higher capacity lithium battery (Note: voltage must be 3.7V) Built-in protection circuit to prevent overcharge and over discharge Retains full access to the Raspberry Pi GPIO interface for use with various expansion boards Application example 1: Programmed automatic data backup and safe shutdown at low battery levels Application example 2: Low battery alerts to prompt user for charging Note: Do not connect the micro USB to the Raspberry Pi; connect it to the UPS HAT board only Specifications: Maximum Output: 5V/2A Maximum Input: 5V/2A Battery Voltage: 3.7V Battery Capacity: 2500mAh Max. Charger Current: 2A Max. Output Current: 2A Board Size: 6.5x5.5cm / 2.56x2.17 inches Battery Size: 6x4cm / 2.36x1.57 inches Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. Ensure you are comfortable with this before purchasing Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you! Package Contents: 1 x Raspi UPS HAT Board 1 x Li-ion Battery (2500mAh)