ROCKBROS Bicycle Mini Pump, Max. 320PSI High - pressure Bicycle Pump, Compatible with Presta and Schrader Valves Weight: 172g Material: 6063 Aluminum Alloy Maximum Pressure: 320PSI Length: 28 - 41.5cm Adjustable Two - stroke Pump The air pressure can be adjusted via an over - pressure valve. 360 - degree Swivel Connector Enables easy and fast inflation at any angle for all types of bicycles. Anti - slip Design The anti - slip grip makes operation more comfortable. Battery Storage A battery compartment is provided for storing two spare batteries.