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 detector
Laar Bioacoustic
Sound analysis software, highspeed harddisk recording (ultrasound)for bats,dolphins,grasshoppers up to 500kHz sampling rate,multi-channel solutions,bat detectors,microphones,monitoring system
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).