This is the Futaba R203HF High Frequency 27MHz Receiver without a crystal. Designed to be used specifically with DIGITAL Servos only! Designed specifically for the new 3PK system. FEATURES: High Response FM signal offers significantly improved processing speed, along with a clearer signal and more precise control. Incredibly small and lightweight. Available in 27MHz and 75MHz. Comes Standard with and will only work with Futaba"s New 3PK. INCLUDES: One R203HF 3-channel 27MHz receiver without a crystal. REQUIRES: Futaba 27MHz short crystal (FUTL61**) Or a Futaba Single conversion crystal such as FUTL52**. SPECS: Dimensions: 1.0x1.5x.5" (25.6mmx37.6mmx14.4mm) Weight: .6 oz (17.4g) COMMENTS: Use ONLY Digital Servos with this receiver! 09-17-02kh ir/kh updt jxs 5/19/05