Wireless vibratory alert device, in case of emergency. Designed for the hearing impaired, it is placed under the pillow and with vibration awakens the person when there is an alarm. Compatible with Calypso-II-R detectors. Autonomy: 300 cycles of vibration or 10 years at rest. Power: 2 AA 1.5V batteries, Dimensions: Ø 95 mm x H 35 mm.