Dual-Unit Slim Voice Intercom System

This two-unit system consists of identical pagers, each sized at 116 x 56 x 18 mm — ultra-slim and easy to carry or place on desks, shelves, or countertops. Each contains a 1800 mAh polymer lithium battery, rated for approximately 3 days of operation under standard usage (five 30-second calls per day). Recharging takes about 5 hours using the supplied cradle (70 x 56 x 29 mm), which also serves as a convenient docking station for always-ready deployment. Designed for resilience in UK climates, it functions reliably from -20°C to 55°C. Its radio module operates on two licensed ISM bands — 434 MHz (A-Mode) and 462 MHz (B-Mode) — enabling up to 1000 metres outdoor range and confirmed 1st-to-8th-floor connectivity indoors. Wall penetration ranges from 20 to 100 metres depending on construction density. Audio includes 38 selectable ringtones and three-step volume adjustment for both incoming alerts (configured in standby) and live voice output (adjusted during call). Clear visual cues are delivered via dedicated intercom and power LEDs. The control interface uses hybrid plastic-silicone buttons with UV-hardened glossy surface, balancing durability and ergonomic responsiveness.