Sonoline B Contec doppler /Backlight LCD 3mhz
Main Features    Built-in speaker    Three work modes: Real-time FHR display mode、averaged FHR displaymode and manual mode    LCD display    Probe inspection    Battery status indicator    Backlight    Auto Shut-OFF: After 1 minute no signal, power off automatically    Suitable Using Range: Suitable for use after the 12th week of pregnancy    Two pieces of standard 1.5V alkaline battery available which can work no less than 10 hours    Output for headphones