This work proposed a novel 4-channel wireless data logger that uses electromyography(EMG), electrocardiograph (EKG), and accelerometer transducers for field measurements ofbiosignals. The logger, which weighs 102 g (including the battery), continually acquires4-channel 16-bit analog signals at 1000 Hz/channel. The acquired data are saved on a microSDmemory card for subsequent analysis. The logger utilizes a ZigBee transceiver module thattransmits acquired data to a remote receiver. The logger can run for over 6 consecutive hours atfull load when powered by two 860 mAh batteries. The remote receiver unit, connected to a PCor laptop via a USB interface, was controlled by Window-based monitoring software for communicatingwith the logger. The monitoring software programmed by Borland C++ Builder operatedthe logger and monitored real-time data sent from the logger. Three laboratory experimentsand two prolonged field tests were performed to test logger feasibility. The experimentalresults demonstrate that the system is reliable and feasible for field measurements of biosignalsfor a prolonged period.