BISTOS BT-350 Fetal Monitor Twin FHR (dual pulsed Doppler) High-sensitivity from the 0.985MHz & waterproof probe Probe holder(4 probe holders on both side) Multiple language support Built-in quick guide (LCD type only) Interpretation function CCV(cross channel verification) function Data saving(450hours) and USB function GE / Philips paper compatible Rechargeable battery (1 hour operation : option) Desktop and wall mount installation