Some electric shavers allow you to use them while they're plugged in, but if you shave on the go, you won't have that option. This is where the cordless running time comes into importance. The best electric razors allow 40-60 minutes of shaving time when they aren't plugged in.
All electric razors are rechargeable. You can charge them either by plugging them in or simply placing them on the charging dock. However, not all electric razors recharge at the same rate. The best shavers for men only take one hour to fully recharge, but some take up to four hours.
Electric razors can provide similar results to manual razors. The difference is that, if you like to shave quickly or even on the go, the right electric razor can be a constant companion.