The TN6000F4 and TN6010F4 differ in colour and battery life. In this review, we'll mainly focus on the better equipped Rowenta Forever Sharp 3in1 TN6000F4, which is black and lasts up to 120 minutes on a single charge. We'll also look at comparisons with the lower TN6010F4 and the rival Philips OneBlade range of trimmers.