Hand-held detector ZKTeco ZK-D100S with a detection indicator located right in the middle of the body and controlled by sound and vibration indication. Working frequency: 22 kHz, built-in siren 75 dB. Indication: light and sound / light and vibration. Powered by a 9V battery. Working voltage: 7-9 V. Dimensions: 85 х 45 х 410 mm.