Differences between CT-7 and CT-7S: Except the difference in the car-ear shape,the largest difference is the headphone driver : CT-7S equip with volume control of 85dB, making it more suitable for children because of this protection feature. CT-7 is more concentrated on the sound quality where children above age of 10 or teenagers or people with a youthful mind. Further we will release WT-8S with theme of stars, together with CT-7, CT-7S, WT-8S forming the Riwbox LED joyful family.They can help you express your emotion and suitable for everyone, adults, student, children or youth. It is a great choice for present for sharing your happiness with your friends and family. LED light switching method: Long press the "M" button to switch the LED light. Specifications: Speaker diameter: 40mm Speaker impedance: 320hm Speaker sensibility: 108db+/-3db Frequency response: 20-20000Hz Working voltage: 3.1-4.2V THD: Mic sn ratio: 40db Mic freq response: 100Hz-80KHz Speaker impedance: 32~ Max. output power: 12Mw Operation range: 10M/360 Material: Plastic Color: Pink Green Weight: 210g Dimension: 176 x 120mm Package include: 1 x Speaker 1 x USB line 1 x 3.5mm audio cable with mic 1 x User manual