... multiple functions, high quality,conpetitive price top 10 chinese security Brands 1 working temperature:-30°C-- +70°C 2 ... panel material is the toughened glass with new technique, and are impacting-proof, scratching proof, with thorough rainproof design. 4,big panel ... on or off line.10,deputy communication can connect with display, and voice system, and has the ability of turning the barrier off ...