The Custo flash 501 is a Holter ECG recorder device for facility sharing and evaluation centers. Composed of three ECG channels and short, integrated ECG wires for artefact-free 24-hours ECG recording and monitoring. Custo sensive adhesive electrodes provides excellent ECG signal quality, best skin compatibility and very efficient. Product specifications are rechargeable battery with run time of 7 days, short wires for artefact-free recording, slim, low-weight, skin-friendly adhesive electrode, recording channels with 2-sampling rate 2.5 ms ± 0.1% per channel and amplitude quantification of 5.6 µ V/Bit ± 1% with 10 Bit in total frequency response of 0.05 - 45.