Bike Pump Electric Mini Portable Bicycle Pump with Digital PSI Pressure Gauge Motocycle MTB Road Bike Tire Inflator

Note:

Before use, please note if there is already gas in the inner tube
1.Inflating a hollow inner tube: first connect the pump to the inner tube valve and then start the pump to inflate the inner tube.

2.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.