A chest percussor is a high speed hand held hammer that when held against the chest replaces manual percussion. It's more effective than a vest and easy to self administer. It's less tiring and more effective than manual percussion. Electro flo 5000 is automated hand percussion. It? S true percussion, not vibration or oscillation. Electro flo 5000 delivers smooth, deep pulses and is much faster than flutter devices.