resistance temperature: 100℃ Length: (round 20 cm: total length from head to tail 27.5cm/metal tube total length 15cm) (square 25 cm: head to tail 24.5cm, rubber tube total length 12cm) Features: 1. Simple plug-and-play design that works with any standard wall outlet or power strip. 2. The flexible rust-resistant metal neck tube is easy to bend to the desired lighting angle and lighting direction. And a stable posture in both upright and bent positions is very powerful.