150PSI Portable Pocket Bike Electric Air Pump Schrader Presta Valve MTB MINI Rechargeable Compressor Tire Inflator HW125

Before use, please note if there is already gas in the inner tube

There are 2 cases as below：

Inflating a hollow inner tube: first connect the pump to the inner tube valve and then start the pump to inflate the inner tube.

Replenishment of an inner tube that already contains air: start the pump first, switch on the inflation mode and finally connect the pump to the inner tube valve to inflate it.