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By certification 
Origin: Guangdong, China (Mainland)
Brand Name: OEM
Model Number: JY-937
Dimension: 35*21.5*20cm Weight: 100g
Capacity: 4000mAh Outport: 5V 1A Input: 5V 1A
Socket Type: USB interface
Color: Blue, Green, Pink, Grey Port: Single port
Battery Cells: 18650 Lithium-ion
Charge Time: 5-6Hours Operating
temperature: -10-40°C
Cycle life: Over 600 times
Accessory: 4+1 charging Cable Market: USA/EUR/S.E.Asian
Brand Name: OEM
Model Number: JY-937
Dimension: 35*21.5*20cm Weight: 100g
Capacity: 4000mAh Outport: 5V 1A Input: 5V 1A
Socket Type: USB interface
Color: Blue, Green, Pink, Grey Port: Single port
Battery Cells: 18650 Lithium-ion
Charge Time: 5-6Hours Operating
temperature: -10-40°C
Cycle life: Over 600 times
Accessory: 4+1 charging Cable Market: USA/EUR/S.E.Asian