Linyun YT1100 Tiantong satellite phone fully supports China's independent Tiantong 1, satellite network supports Tiantong Beidou & GPS dual-mode fast positioning and navigation, screen 2.4-inch 140mm × 65.8mm × 25mm storage: MicroSD card, maximum support for 64GB expansion, RAM512MB, ROM256MB battery 5000mAh, long endurance reliable connection, support for encryption and high voice quality, emergency call and SOS one-key rescue three-prevention design, support for IP68 protection level, the equipment is light and durable to meet the requirements of use in harsh environments.# Toppen A50Ex Hydrogen Explosion-proof Digital Interphone# Public Network Interphone# Binqi BQ-278 Public Network Interphone# S60 Professional National Interphone# Binqi Interphone# Hua An Jiexun Interphone# Youlitong Interphone# Public Network Cluster Interphone# PDT Cluster Interphone# Explosion-proof Public Network Interphone# National Interphone# Ruyitong Interphone# Single Beidou Positioning Interphone# Multimode Intelligent Cluster Interphone