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In this paper we present a wireless ECG plaster that can be used for real-time monitoring of ECG in cardiac patients. The proposed device is light weight (25 grams), wearable and can wirelessly transmit the patient's ECG signal to mobile phone or PC using ZigBee. The device has a battery life of around 26 hours while in continuous operation, owing to the proposed ultra-low power ECG acquisition front end chip. The prototype has been verified in clinical trials.