Frequency : 406 MHz/121.5 MHz. Hermetic construction and automatic release mechanism at water drop. Approved according following : CCIR, RTCM, COSPAS-SARSAT, GMDSS and IMO. Material of the body – ABS plastic. Li-ion Battery, 4 years life. Temperature range : - 20°Ñ to + 50°Ñ. Working time after release – 48 hours at – 20°Ñ and 80 hours at +20°Ñ. Manufacturer – Samyung Enc. South Korea.