See also:

• Recreation: Outdoors: Wildlife: Bats  (64)
• Science: Biology: Products and Services: Field Biology  (5)

Belfry Bat Detector: - Hand built to order, an assembled unit that is portable, small, lightweight and is powered by a 9 volt battery.

Bertrik's bat detector page: - Information on building your own bat detecto.

Convergence Technologies, Inc. (USA): - Bat detector.

Pettersson Elektronik AB (Sweden): - Bat detector.

Stag Electronics: - Bat detectors, books and CDs of bat echolocation, downloads of bat sounds and bat music.

Ultra Sound Advice (UK): - Various ultrasound devices (air ultrasound, bat detectors, and data logger).