Philips Hue Smart Bulb E26 Hue White 800lm Although it can be registered in the app, the brightness control is unstable. Even if turned off via the app, it doesn't completely turn off and remains lit. (It turns off completely if turned off with a physical switch.) Even when turned off via Bluetooth, the light remains dimly lit. Since all four bulbs have the same issue, it seems to be a known symptom that appears with prolonged use. It might be good to use it as an LED bulb for the purpose of turning it on and off. Model Number: 9290023133 Usage Period: About 2 years Defects: All bulbs remain lit even when turned off via Bluetooth. ▲ The registration QR code is faded and cannot be read by the app. (Registration is possible with the serial number.) ▲ Firmware cannot be updated. ※ This is a defective product, so please use it as is or have it repaired by the buyer. ※ The outlet and socket for photography are not included in the listing. -------------------------------------------------- ■ Shipping is planned via Yu-Packet Plus. ■ Packaging will be simple, using recycled materials. ※ The shipping method may be changed by us to a method that allows for faster processing. --------------------------------------------------