Heterodyne bat detector that is ideal for use during a bat excursion. The Pettersson D100 Bat Detector incorporates the latest, high sensitivity technology to help you locate and identify the bats in your area. The sensitive microphone picks up bat calls and converts them into an audible stream of sounds. ADDITIONAL INFORMATION Weight: 220 g Dimensions: 113 × 71 × 33 mm Class: Heterodyne Microphone: Electret + ceramic Frequency range: 10 - 120 kHz (min.) Bandwidth: 8 kHz (+/- 4 kHz), -6 dB Battery: 1 x IEC 6LF22 (9 V) Quiescent current: 16 mA typ.   Size :113 x 71 x 33 mm (113 x 71 x 63 mm including knobs)   Outputs: 2 x 3.5 mm jacks for headphones and recorder