Smart Pet Water Fountain PW001 Model PW001 Input Voltage DC 12V 0.5A Power 4W Capacity 2L Button Restart Size 220mmX220mmX166mm Weight: 1350g TDS display Yes Wi-Fi —— Recommended pet type cats and small, medium-sized dogs Pet Fountain PW003 Model PW003 Input Voltage DC 5V 0.5A Power 2W Capacity 2.5L Button Power off／ON Size 165mmX165mmX157mm Weight: 630g Wi-Fi —— Recommended pet type: cats and small, medium-sized dogs