Sonotrax Pro is backlight. It has an audio playback and audio output, which can be connected with earphone or recorder.

Features:

• Ergonomic design, compact and light
• Easy-to-use
• Large backlight LCD display
• Accurate FHR detection with clear sound
• High sensitivity interchangeable probe
• Waterproof probe
• Automatic and manual FHR Counting
• Long time continuous use (about 8h)
• Automatic power-off