Revolutionary Triple-Lens Bullet-PTZ Camera: A single groundbreaking device that replaces and outperforms separate bullet and PTZ cameras. The upper 4K bullet lens delivers a 130° fixed wide view, while the lower 2K dual-lens PTZ offers 360° smart tracking and zoom. Bullet-to-PTZ Tracking and Auto-Framing: Once the bullet cam detects a subject, the PTZ camera instantly locks on, tracks, and zooms in to capture details up to 164 ft away. When more subjects enter the frame, it automatically zooms out to ensure they all stay visible. Powerful Solar-Charging with SolarPlus™: Stay charged year-round with a 5.5W ultra-large solar panel and SolarPlus™ 2.0. Just 1 hour of direct sunlight a day keeps the camera running, and the detachable design makes setup easy and flexible.  Great on Its Own: eufyCam S4 can work independently—no HomeBase™ needed. It features on-device AI for smart human, vehicle, and pet detection. It comes with 32 GB built-in storage, expandable up to 256 GB via microSD (not included). Better with HomeBase™ S380: Unlock BionicMind™ AI to differentiate family from strangers. With 16 GB built-in storage, expandable up to 16 TB, rest easy knowing your videos are stored securely. If you already own a HomeBase™ S380, please make sure it’s updated to version V3.7.2.8 or later, and your eufy app is updated to the latest version to enable 24/7 recording and Snapshot features.*HomeBase™ 2(Homebase™ S280) , Homebase™ mini, Homebase™ Professional and eufy NVR are not currently supported. Precise Detection, Powerful Deterrence: Radar and PIR sensors deliver precise motion alerts with fewer false alarms. When a threat is detected within your set zone or schedule, red and blue warning lights and a 105 dB siren activate to deter intruders. Rechargeable Battery: 10,000 mAh Capacity compliments each advanced feature. Rechargeable: Save you money and enjoy the convenience that single-use batteries never have. Easily Swap the Battery Without Moving the Device.