Based on this product's specifications, here are some alternatives and similar models
Portable Battery RealPower PB-4000, 4000 mAh
Summary description:
The RealPower PB-4000 is a portable lithium polymer battery with a capacity of 4000 mAh. It features one USB Type-A output port with a 2 A output current, making it ideal for charging your devices on the go. Available in stylish blue and silver colors, this compact battery is perfect for everyday use.