Fetal Doppler JPD-100T JPD-200C Features: One plug with two probes can be switched easily. LCD displays FHR (JPD-200C) LCD displays time (JPD-100T) One hand operating of on/off, volume up/down. Specification: Ultrasound frequency 2.2 MHz, 3.3 MHz (optional), ± 10% Maximum sensitivity 100dB, 9 weeks fetus Ultrasound intensity < 5mW/cm2 FHR measuring range 50 - 210 BPM Display FHR at Digit Time at Digit Power supply Built-in battery, 12hours after full charged AC 220V / 50Hz (or AC 110V / 60 Hz) Dimension 240*160*115mm Net weight 1.12 kg Package 38*28*17cm (1set) 57*40*38cm (4sets) Gross weight 3.5kgs (1set) 14.5kgs (4sets) Standard Accessories Ultrasound probe 2.2MHz AC/DC adapter Automatic charging stand Battery (fixed in) Operation Manual