Philips Wake-Up Light HF3521/01

Type: wake-up light with a reading lamp and night light.
Sunrise simulation: light gradually increases from red through orange to yellow; duration adjustable from 20 to 40 minutes.
Lighting: 20 brightness levels, illuminance up to 300 lux.
Wake-up sounds: 6 built-in options; you can also wake up to FM radio.
Alarm: two independent wake-up times; a tap on the device activates a 9-minute snooze for the sound alarm.
Bedtime: sunset simulation with gradually decreasing light brightness.
Night light: soft orange light, activated by tapping the device twice.
Display: automatic brightness adjustment according to the room’s ambient light.
Power supply: mains-powered via an adapter, 100–240 volts; cable length 1.5 metres.
Dimensions: 19.2 × 19.9 × 14.6 centimetres. Weight: 730 grams.

Compared with HF3532/01: HF3521/01 has FM radio but offers 6 wake-up sounds instead of 7 and has no USB port for charging a phone. HF3532/01 offers USB charging but has no FM radio.
Compared with HF3531/01: both models have FM radio, coloured sunrise simulation, a night light and two alarms. HF3531/01 additionally offers USB phone charging, 7 sounds instead of 6, and nature sounds that fade together with the light in sunset mode.