Wireless smart relay that brings any low-voltage circuit under Ajax control — gate motors, garage doors, electric locks, irrigation valves, lighting circuits, intercom strikes, boilers, HVAC zones. Compact enough (39×33×18 mm) to disappear inside a standard junction box or electrical panel, Relay switches loads up to 5A at 7-24V DC via a potential-free dry contact, with three operating modes selectable in the Ajax app: bistable (toggle on/off), pulse (timed activation from 0.5 to 255 seconds — ideal for door-strike pulses or gate-trigger inputs), and counter-action for sequence logic. Pairing takes under a minute: scan the QR code on the housing with the Ajax app, mount in the junction box, choose internal or external antenna depending on enclosure shielding. The flexible external antenna option recovers signal where metal panels would otherwise block it. It pairs with the Ajax Hub 2 over the encrypted Jeweller radio protocol at distances up to 1,000m line-of-sight, includes two-way communication so the hub confirms each switch action, and supports tamper detection. Operates from -10°C to +40°C, with up to 100 relays per hub. Triggered by any device in your Ajax system: motion detector arms hallway lights, a Button press opens the garage, a fire alarm cuts power to the boiler, a scheduled scenario waters the garden at sunrise. Ideal for villa automation upgrades, office access control, retail back-of-house — anywhere security and automation converge on the same hub.